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The problem with that allegation is that Chicago police said there was no evidence to back it up, and DeRay Mckesson, a leading Black Lives Matter organizer, said such violent acts never have been the organization's intention.

Yet the hashtag #BLMKidnapping continued to trend on Twitter, helped along by Glenn Beck, Twitter activists and some other voices for conventional conservatism and the "alt-right," a snazzy new-wave label for old-school white supremacy.

After all, the more attention they put on Black Lives Matter, deserved or not, the less attention goes to the police conduct issues that the protest movement is trying to raise -- ostensibly not to bash police but to improve policing.

Unfortunately, there are many ways to profit by feeding public anger, fears, resentments and suspicions. You can even win elections sometimes.

You can see evidence of today's racial divide in polls like the one taken in November by the liberal Huffington Post and YouGov. It found that a commanding 84 percent of Hillary Clinton voters thought black people face "a lot of discrimination" in the United States today, compared to only 22 percent of Trump voters.

With such stark differences in political attitudes, it is no wonder that a July Washington Post/ABC poll found 63 percent of adults said race relations are in bad shape, up from 48 in a Pew Research survey last spring.

We would be making a mistake if we try to blame all of that on outgoing President Barack Obama, he told Jay Levine from Chicago's CBS2 in a White House interview. It is not that racial tensions have gotten worse, he said, but smart phones and the Internet bring the ugliest episodes of different communities to a wider audience than ever before.

"I think the overall trajectory of race relations in this country is actually very positive," he said. "It doesn't mean that all racial problems have gone away. It means that we have the capacity to get better."

Sure, he's protecting his legacy, but he's got a point. Unfortunately, too many people don't seem to want us to get better. They'd rather complain.

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(E-mail Clarence Page at cpage@chicagotribune.com.)

(c) 2017 CLARENCE PAGE DISTRIBUTED BY TRIBUNE MEDIA SERVICES, INC.