How Do We Stop Crazy People From Using Guns In Hate Crimes?

I am curious what common sense gun laws is Ms. Clinton and the Whitehouse referring to that will stop a crazy person like Vester Flanagan(aka Bryce Williams) from committing a hate crime. Is she advocating increased background checks on black men or just gay, black men with anger management issues? Is she suggesting that every gun store have a psychologist on staff? Unlike the Virginia Tech gunman Seung-Hui Cho, Mr. Flanagan probably seemed normal to his friends. Mr. Flanagan has said that he targeted these two young, white people because he thought they were racists. I am sorry. They just do not fit the stereotype. So how do you convince people exhibiting the same symptoms as Mr. Flanagan to put down the gun and seek counseling?