I think you underestimate the entertainment value of intentionally posting inflammatory things. It's fun to play devil's advocate. That doesn't mean you believe it.
Serious question: is it possible to play devil's advocate without insincere motivations? For example, say someone holds a strong but simplistic belief on a complex topic, if asking a legitimate question in a straightforward and non-offensive manner upsets the person holding the belief, is it necessarily (and always) a form of aggression?
Hmmmm....can you think of an example of a case where "asking a legitimate question in a straightforward and non-offensive manner" about suicide cults would not be easily distinguishable from an attempt at recruitment?
So, it is necessarily (and always) a form of aggression then?