At its core, trolling is all about insincerity and sadism.
People can purposefully antagonize others, post controversial / inflammatory / off-topic messages, provoke others and not be trolls at all. Happens all the time on topic involving politics / geopolitics.
@bob smith is right. No real trolls on AN. Petty sh$tposters now and then but that's it.
As for rule 10, let's not forget a simple truth: application of the term troll is subjective.
Therefore it shouldn't show in forum rules.
That rule is one of the reasons why moderation was so bad at times.
It allows mods to freestyle depending on how they feel towards certain people.