We don't know all the answers yet and I would caution against jumping to conclusions until we have all the facts.
White policeman arrests black Harvard professor on a rant: President Obama says:
I think it’s fair to say, No. 1, any of us would be pretty angry.No. 2, that the Cambridge police acted stupidly in arresting somebody when there was already proof that they were in their own home. And No. 3 — what I think we know separate and apart from this incident — is that there is a long history in this country of African-Americans and Latinos being stopped by law enforcement disproportionately, and that’s just a fact.