Religion gone crazy

What is it with religion, that its followers turn crazy, having no repect for human life in the name of their god???
Is it just "certain" religions? If yes, what is wrong?
Latest example ( but surely to be followed by many more):

Ohio State attacker said he was 'scared' to pray in public

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And please, do not blame it on others! Try for once not to be politically correct, but truthful.