It's the same concept of people being assholes online, but applied to those belief structures. They are just taking the freedom that anonymity provides and acting like their true selves. They're just too afraid to be such insufferable assholes in person because of the response they KNOW they would receive.
Based on a post from 2 hours ago, it seems like cannedtuna has begun power trippin. Entire thread locked, most comments deleted by mod. Hiss-boo. Doesn't make for an entertaining post.
This does not require an explanation, there is a correct answer and people doing it the other way are wrong.