These things are part of a shifting, moving universe, they are going to happen because there is no "God" preventing them. (Regardless of whether you believe in him or not, he is not preventing them.)
I really don't think that believers are blaming God. No, that is not popular in today's climate. I think that believers are wasting a bunch of effort praying and turning to a God who didn't prevent such things and will not undo them. I include "Don't blame God" because when I read the likes of TEC's comments, I think believers actually think that unbelievers are BLAMING God when we take the position that God did nothing to stop the tragedy. God isn't there. I know that.