How do we know there are no reports of Islamic leaders criticizing this crime? Really... how do we know this?

Every single time I have seen someone make a statement like that one, and I've taken the time to find out, I have found that the person making such a statement simply hasn't bothered to find out. It doesn't help that our media consistently refuse to report when Islamic leaders condemn such acts. But that is a manifestation of the anti-Muslim prejudice that I am talking about that we see here in the West.