Yes, an atheist may do such heinous act but I doubt it would ever be done in the name of atheism. 
I could say that he wasnât âa real atheistâ because real atheists donât do such things.
But since an atheist doesnât have an absolute moral standard, how would he know that it was a heinous act. Perhaps it was Schrödingerâs cat which is allowed to be killed in quantum mechanical thought experiments.
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