"One of the great things about America is that individual citizens and groups of citizens can petition their government, can protest, can speak truth to power. And that is sometimes messy and controversial. But because of that ability to protest and engage in free speech, America, over time, has gotten better. We've all benefited from that. The abolition movement was contentious. The effort for women to get the right to vote was contentious and messy. There were times when activists might have engaged in rhetoric that was overheated and occasionally counterproductive. But the point was to raise issues so that we, as a society, could grapple with it. The same was true with the Civil Rights Movement, the union movement, the environmental movement, the anti-war movement during Vietnam. And I think what you're seeing now is part of that longstanding tradition. What I would say is this -- that whenever those of us who are concerned about fairness in the criminal justice system attack police officers, you are doing a disservice to the cause. First of all, any violence directed at police officers is a reprehensible crime and needs to be prosecuted. But even rhetorically, if we paint police in broad brush, without recognizing that the vast majority of police officers are doing a really good job and are trying to protect people and do so fairly and without racial bias, if our rhetoric does not recognize that, then we're going to lose allies in the reform cause.Now, in a movement like Black Lives Matter, there's always going to be some folks who say things that are stupid, or imprudent, or overgeneralized, or harsh. And I don't think that you can hold well-meaning activists who are doing the right thing and peacefully protesting responsible for everything that is uttered at a protest site."