The whole nation (including many whites) was in an uproar against "white people" when Trayvon was killed by a latino guy (made no sense, of course). Even Obama joined the fanfare. Now that three black guys kill a (truly) white guy in pretty much cold blood (no blurry details, no questions about self-defense), I wonder what the reaction is going to be like? People flooding NYC with signs saying "I am Chris!! We are Chris"? Doubtful. Consider that one of the killers had clear racial remarks on their twitter against "white people".
The best thing to do would be to just leave race out no matter which situation it is, but no, society just can't do that. But it is important, in this case, to point out which stories get the "big reactions" and which don't.