There are all sorts of lessons we can learn from the interview B37 had with Anderson Cooper. I’ll mention two. Add in others if you want.
1. Implicit biases can operate as described in most papers on it.. E.g., you can firmly believe no one in your group is a bigot while demonstrating your own bigotry. Thus your group may decide that Zimmerman is a fundamentally good person, while Trayon contributed a lot to his own death.
2. One can activate implicit biases in others in much the same way that one can activate stereotype threat. That is, one just needs to get people using concepts closely associated with, e.g., a frightening situation with Africam American men in order to activate the belief that black men are dangerous. Just having someone testify about a house-breaking by Black Men to get a jury ready to see a black kid as dangerous. Points to the clever defense.
See part of the interview here: