Coleman Hughes shares a good perspective on this in his new book. He cites surveys showing that people changed their opinions for the worse regarding racism in america around 2010. This could be explained by an increase in racism or by increased awareness of racism. But he shows it is not based on these things because surveys also show that people significantly overestimate the number of black people killed by police. The rise in media coverage has led them to think that certain events are much more common than they are.