It's a taboo. Most people would also say they don't have violent thoughts, even though literally everyone has thought about punching some asshole who deserved it at some point.
Never the less, it is very real. If you live in a tribe where eating fish is a taboo, then you'd better not fucking eat fish, or you'll get ostracized, even though people have long forgotten why exactly their ancestors became disgusted with fish eaters in the first place.
>find pizza on p2p
Uhg, I know that feel. I was paranoid for years afterward. Pretty sure the statute of limitations is up by now, but holy shit I was a retarded teen.