Obviously, people kill people. We do need to take a look at the tools they are using. No matter what, there is absolutely no reason Cruz should have been legally allowed to purchase an assault weapon which is only designed to mow down groups of humans in small amounts of time.
There is absolutely no reason why a violent demon worshiper with a past history of assaulting children should have been allowed lose. Cruz was dangerous with or without a gun, and if he had been a non Hispanic white, would have been locked up.