Why Now, White People?

The video is horrific, and the brutality is stark. But that was the case in Ferguson, Mo., in 2014 and Minnesota in 2016. This time, though, white people are out in the streets in big numbers, and books such as "So You Want to Talk About Race" and "How to Be an Antiracist" top the bestseller lists. So we asked some white people: What's different this time?