Yeah...like anything is. Let a mentally unstable person read the Bible/Koran/Torah and he'll find reasons to do crazy shit. Let him listen to a Beatles song and he'll find messages in there that will tell him to do crazy shit. Give him a knife or a gun and he'll think it's a good idea to see what it does on the mailman the next day.
How about they make a study that documents how we can stop mental jobs from going coo-coo instead of trying to link it to external factors which are clearly largely unrelated?