The Left needs to do some hard thinking about whether the loudest of its mouths have put blood on its hands in Dallas. The irresponsible drumbeat of accusations that have pounded into the American psyche the falsehoods that racism is endemic in criminal justice system and that police killing blacks is a pervasive problem very likely contributed to the killing of five police officers.

In her statement about the Dallas shootings, Attorney General Loretta Lynch could be found blaming American “society,” the lack of “equal justice,” and guns.

Liberals have created a dangerous environment in which cops are villains and guys who knock over convenience stores heroes.

“We must continue working to build trust between communities and law enforcement,” Lynch said at a press conference Friday, “We must continue working to guarantee every person in this country equal justice under the law. We must take a hard look at the ease with which wrongdoers can get their hands on deadly weapons and the frequency with which they use them. We must reflect on the kind of country we want to build and the kind of society we want to pass on to our children.”

Even before Lynch, and just hours after police had been massacred in Dallas, Congressional Black Caucus Chairman G.K. Butterfield, D-N.C., was calling for gun control and decrying “police misconduct.” “We don’t need to leave the Hill this week or any week without assuring the American people that we understand the problem of police misconduct in America,” he said.

Such irresponsible talk is deeply ironic, since for Republicans incarcerated in the liberal jailhouse of political correctness, the message is always clear: Watch what you say.

Want to defend the Second Amendment? You must be in the pocket of the NRA and not give a damn about mass shootings. Say something against unlimited and illegal immigration? Clearly you’re a racist who doesn’t want anyone darker than you milling around the country. Argue against mandatory equal pay? You’re part of the war on women and contributing to discrimination against them. The list goes on.

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But the Left, convinced its cause is unassailably righteous, feels no constraint in what it says. And so in the wake of isolated police killings of unarmed black men over the past two years — some justified, some not — and with passions stoked by the presence of video cameras, liberals have created a dangerous environment in which cops are villains and guys who knock over convenience stores heroes.

The rhetoric over the past several days fostered attitudes that arguably led to police shootings in Dallas by an assailant who admitted he was angry about highly publicized shootings by police and wanted to kill whites.

Democratic politicians, starting with President Obama, weighed in before the facts were clear with the unmistakable suggestion that the officers who killed unarmed black men in Baton Rouge, Louisiana and Falcon Heights, Minnesota must have used excessive force animated by racism.

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Obama took time out from the NATO Summit in Poland to send the clear signal that the killings were part of a pattern of racism. While careful to cover his rhetoric with compliments for the police, the central message was that racist cops were murdering blacks, and the African American community has much to fear.

“There is no contradiction between us supporting law enforcement … and also saying that there are problems across our criminal justice system, (that) there are biases — some conscious and unconscious — that have to be rooted out,” Obama said. “What I can say is that all of us as Americans should be troubled by these shootings, because these are not isolated incidents. They’re symptomatic of a broader set of racial disparities that exist in our criminal justice system.”

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Offering a laundry list of statistics that supposedly show blacks are singled out, Obama said Baton Rouge and Falcon Heights were just the latest outrage: “When incidents like this occur, there’s a big chunk of our fellow citizenry that feels as if because of the color of their skin, they are not being treated the same. And that hurts.”

Sure, African Americans have more brushes with the law. That’s mainly because they are far more likely than whites to commit crimes. It wouldn’t occur to Obama that liberal policies that have kept blacks in ghettoes for decades are to blame. Easier to blame the police.

Democratic Minnesota Gov. Mark Dayton felt at liberty to get inside the head of the Falcon Heights policemen, even though the reasons for the traffic-stop shooting were far from clear.

“Would this have happened if … the driver and passenger were white?” he asked. “I don’t think it would’ve. So I’m forced to confront and I think all of us in Minnesota are forced to confront that this kind of racism exists.”

The leftist Congressional Black Caucus was at a fever pitch, using the unrelated appearance of FBI Director Comey before the House Oversight Committee to somehow work in police-on-black violence.

New Jersey Congresswoman Bonnie Watson Coleman asked Comey whether it wasn’t important “to remind people of the loss of a Tamir Rice to an Eric Garner to an Alton Sterling to a John Crawford to a Michael Brown to a Walter Scott and even a Sandra Bland.”

Sterling was the man killed in Baton Rouge.

Sen. Elizabeth Warren took to twitter:

“We’ve seen the sickening videos of black Americans killed in traffic stops. Lives ended by those sworn to protect them. #blacklivesmatter,” she tweeted.

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In another tweet, she said:

“We can’t ignore the ugly reality: black parents are terrified that teaching kids to “survive” the police won’t be enough. #blacklivesmatter”

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Sen. Bernie Sanders agreed, tweeting, “As South Carolina Rep. Wendell Gilliard proclaimed: ‘Enough is enough of our police officers targeting people of color.’

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Jesse Jackson of course chimed in, comparing the police to the Ku Klux Klan.

“It’s a pattern,” he declared. “When I grew up, it was white sheets and covered faces. Now it’s audaciously, blue uniforms.”

The tragedy of these attacks on the police and the allegations of widespread misconduct and racism is not just that it probably helped set the scene for the nightmare in Dallas. By emphasizing a marginal issue compared to that of black on black violence, liberals ensure that less of a focus is directed at the real carnage being inflicted on black Americans by other black Americans. And they intimidate police from doing the job they are dedicated to: protecting all citizens, including — and especially — African Americans.