Also, 40 or 50% of people believe in witches, angels and that aliens are living among us. Belief doesn't mean anything. It's easily swayed. All that matters is the data. There's been violent people before and after games. There always has to be some societal scapegoat to divert people away from the real problems because people don't want to actually solve them, they just want to appear to be offended.
All through history, from the opera(yup), books, movies, comics, rock and roll, rap, heavy metal and now video games, a societal pariah must exist for the collective to point at and blame so they can passively move on and neglect the truly important issues.