There are trolls, and then there are trolls. Back in the day, most of the trolls were just 'acting out' their own inner ahole. But that was then and this is now. There is another agenda afoot.
A new breed of propaganda trolls are much more sophisticated than they were back in the early wild wild west days of the internet. They are very cognizent of manners, civility and politeness. To the point that they end up preaching to those that they continually incite and anger (ie their job) about that same lack of civility. It's hilarious to observe. They provoke, then they chastise. They actually think that they are undetectable re: their intent. But... much like everything else the idiot left does and says... they'd be wrong about that too.