With your first post, it sounded like you were testing the waters to see how trolling was handled here by the normal group of posters which was why we all let you know it's not acceptable & is dealt with strongly.
As for why you do it on other posts.....sometimes it's just someone's personality....I know that I was married to someone for 33 years who would argue about something no matter what you said...I have come to realize that he does have an undiagnosed problem that wasn't even possible to diagnose until 1994....& it tends to make his mind work that way.....but just because one's mind works that way doesn't mean that it's acceptable.
Then there are some people who just like attention by stirring up trouble.
I'm sure if you really stop to think about what feelings you get when you do that....you could answer your question yourself.....just takes getting in touch with your thoughts & feelings.