The Memo: Bomb attacks expose festering divisions 

Partisan enmity, incendiary rhetoric and polarization were under a more intense spotlight than ever Wednesday after crude explosive devices were sent to several leading Democratic politicians and to CNN.

President TrumpDonald John TrumpLiz Cheney: 'Send her back' chant 'inappropriate' but not about race, gender Booker: Trump is 'worse than a racist' Top Democrat insists country hasn't moved on from Mueller MORE, addressing the crisis briefly at the White House, insisted that “we have to unify, we have to come together.”

But Democrats and liberal commentators reacted with scorn to that message, pointing the finger at Trump for injecting toxins into the nation’s political bloodstream.

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Trump was accused of encouraging violence at his rallies during the 2016 presidential race, on one occasion pledging to pay the legal fees of anyone who were to “knock the crap” out of protestors. 

He has consistently called his 2016 Democratic opponent Hillary ClintonHillary Diane Rodham ClintonGeorge Takei: US has hit a new low under Trump Democrats slam Puerto Rico governor over 'shameful' comments, back protesters Matt Gaetz ahead of Mueller hearing: 'We are going to reelect the president' MORE — one of the targets of this week's attacks — “crooked.” And he has blasted the news media as the “enemy of the American people.”

During his White House remarks on Wednesday, however, he said that “acts and threats of political violence have no place in the United States of America.” He also described the attacks as “egregious” and “abhorrent.”

There were other calls on unity from both sides. 

Former Vice President Joe BidenJoe BidenHarris faces pressure to define policy proposals Biden campaign rips 'Medicare for All,' calls on Dems to protect Affordable Care Act Harris voices support for Puerto Rico protesters: 'I stand with them' MORE tweeted that “this country has to come together. This division, this hatred, this ugliness has to end.” 

2012 GOP presidential nominee — and current Senate candidate — Mitt RomneyWillard (Mitt) Mitt RomneyDemocrats should rise above and unify against Trump's tweets Trump steps up attacks on 'Squad' after post-rally furor Media cried wolf: Calling every Republican a racist lost its bite MORE said that “hate acts follow hate speech. It is past time for us to turn down and tune out the rabid rhetoric.”

But that looks to be easier said than done. 

Polarization in the United States has been growing for decades. Trump’s rise was, at the least, a symptom as much as a cause of chasms that have been widened by numerous factors: the rise of talk radio as far back as the 1990s, the self-perpetuating ideological dynamics of social media and an overall rise in partisan sentiment. 

According to a Pew Research Center report from 2014 — a year before Trump even began running for president — 45 percent of people who expressed mainly conservative views said they would be “unhappy” if a family member married a Democrat. Thirty-one percent of people who expressed mainly liberal views said they would be equally displeased if a family member wed a Republican.  

In the same report, a full 50 percent of people who held “consistently conservative” views — and 35 percent of people who held “consistently liberal” views — said it was important for them to live in a place “where most people share my political views.” 

Even on Wednesday, the calls for unity were soon swallowed up by appeals that fell squarely along partisan lines.

The two leading Democrats on Capitol Hill, Senate Minority Leader Charles SchumerCharles (Chuck) Ellis SchumerDem senator describes 'overcrowded quarters,' 'harsh odor' at border facilities Top Democrats demand security assessment of Trump properties Lawmakers pay tribute to late Justice Stevens MORE (N.Y.) and House Minority Leader Nancy PelosiNancy PelosiDemocrats should rise above and unify against Trump's tweets 10 questions for Robert Mueller Ocasio-Cortez tears into Trump's immigration agenda: 'It's about ethnicity and racism' MORE (Calif.), issued a joint statement saying that Trump’s words would “ring hollow until he reverses his statements that condone acts of violence.”

Meanwhile, some hard-right figures and media provocateurs who support Trump pushed the unsupported idea that the attacks could have been “false flag” operations intended to engender sympathy for Democrats and the media.

Other, more mainstream conservatives were quick to note that the specter of political violence was not something that was only directed at figures on the left.

House Majority Whip Steve ScaliseStephen (Steve) Joseph ScaliseThe Memo: Fears of violence grow amid Trump race storm Democrats call for increased security after 'send her back' chants Democratic strategist on Trump tweets: 'He's feeding this fear and hate' MORE (R-La.) was shot and seriously injured last year in Alexandria, Va., after a gunman attacked a group of congressional Republicans who were practicing for a charity baseball game. The shooter in that case, James Hodgkinson, held left-wing political views. He died after a shootout with police. 

Trump went ahead with a scheduled rally in Mosinee, Wis., on Wednesday evening. He delivered a somewhat more low-key oration than usual, calling the apparent use of bombs "an attack on our democracy itself" that "must be fiercely opposed and firmly prosecuted." But he also insisted that the media should "stop the endless hostility and constant negative and often false attacks and stories." 

Former President Obama and Clinton were the most prominent targets of the pipe bombs on Tuesday and Wednesday. Devices were addressed to both of their homes but were intercepted at screening facilities.

Other Democratic politicians targeted with the suspect devices included Rep. Maxine WatersMaxine Moore WatersHillicon Valley: Trump seeks review of Pentagon cloud-computing contract | FTC weighs updating kids' internet privacy rules | Schumer calls for FaceApp probe | Report says states need more money to secure elections Here are the 95 Democrats who voted to support impeachment Maxine Waters says her committee will call in Zuckerberg to testify about Libra MORE (Calif.) and former Attorney General Eric HolderEric Himpton HolderFeds will not charge officer who killed Eric Garner The old 'state rights' and the new state power The Hill's Morning Report — Harris brings her A game to Miami debate MORE

The package intended for delivery to Holder was returned, but to an office affiliated with Rep. Debbie Wasserman SchultzDeborah (Debbie) Wasserman SchultzEpstein charges show Congress must act to protect children from abuse NYT: Don't make Acosta a political martyr Epstein charges put Trump Labor secretary back in spotlight MORE (Fla.), the former Democratic National Committee chairwoman. A crude bomb, discovered on Monday, was also sent to liberal donor and billionaire George Soros. 

A reportedly near-identical bomb was received at CNN’s facility at the Time Warner Center in New York City on Wednesday. It was addressed to John BrennanJohn Owen BrennanWebb: Questions for Robert Mueller A brief timeline of Trump's clashes with intelligence director Dan Coats Trump critic Brennan praises his Iran decision: I 'applaud' him MORE, the CIA director under Obama and a prominent Trump critic. The device's discovery led to an evacuation of the building, the beginning of which occurred during a live broadcast from that location.

Trump has consistently lambasted CNN as “fake news,” and signs and merchandise attacking the network are often seen at his rallies. Outside a rally earlier this month in Erie, Pa., T-shirts proclaiming “CNN Sucks!” and rendering its full name as “Communist News Network” were on sale at one stall close to the venue. (Such stalls are private enterprises, not affiliated with the president’s political network.)

CNN President Jeff Zucker, who has often tangled with the president in the past, issued a statement in which he blasted the White House for a “total and complete lack of understanding ... about the seriousness of their continued attacks on the media.” 

Zucker complained that Trump and his White House press secretary, Sarah Huckabee Sanders, had “shown no comprehension of that.”

But such statements, justified or not, themselves prove that the tide of polarization will not easily be turned back. And that leaves people on all points of the political spectrum fearful about what might come next.

The Memo is a reported column by Niall Stanage, primarily focused on Donald Trump’s presidency.