The race of the criminal or victims shouldn't be an issue,the issue is that any harm to any person is wrong.A non-violent solution to cure those that feel the need to harm others would resolve that.
All lives matter!
All lives do matter. But all black lives matter exists not to say that white people don't matter, it's because they're killed because of racism. When people say all black lives matter, there are not saying other peoples' lives don't matter. It's to combat racism and oppression and to try to put an end to unfair discrimination. White people are not oppressed for being white, but black people are.