The OP isn't stupid but perhaps a not so subtle attempt at race baiting, although one could argue that the member merely wants to shed some light on the fact that, indeed, most mass killers are white. I would like to add the OKC bomber (McVeigh) to that list.
In comparison, we have a few white individuals who kill x amount of people, while otoh we must also count those who have killed just as many but not in one day. Those are the ones who don't make it into the news, they are killers of masses, but not mass killers.
So that leaves us with the sad fact that people are dead, families and friends lost loved ones, yet here we sit and argue about color of skin.