I read it as- there are psychopaths operating within and bizarre malicious ideas being propagated through those hobbies and mediums. I'm inclined to agree, but

I read it as- there are psychopaths operating within and bizarre malicious ideas being propagated through those hobbies and mediums. I'm inclined to agree, but I wouldn't single it out to any specific hobby, activity, forum, news-source- though some are definitely more prone to infestation.