They may indeed feel that way, but a rational being would not blame the creation for faults the creator emended into the creation. If anything, Atheist's should be the most moral because they have no one to blame but themselves. Of course that does not generally play out in reality, since many atheist's are just rebelling against a system they disagree with and are looking for a way to not be held accountable. But then again which part of our existence is rational?