This is a topic which I have covered in other ways before, both in the piece “Have I killed someone?” and “A Great Myth about Atheism: Hitler/Stalin/Pol Pot = Atheism = Atrocity – REDUX”. This idea that atheism causes people to do X or Y has reared its ugly head. Why am I mentioning this now? Anton Lundin-Pettersson went into a school in Sweden with a mask and helmet, looking pretty dark, and a sword, and killed two people. And it looks like he was an atheist.
PZ Myers has written about it. He did not say that Anton Lundin-Pettersson was an atheist and that this caused his killing spree, but that atheists don’t like admitting when one of their own is a bad person, that atheists pull the No True Scotsman fallacy and skew the stats on atheist atrocities.