I was just in the SF OPEN antispam server, the behaviour I described in the first paragraph was happening just 5-10mins ago. I know it's not always like this, but it definitely happens. I'm not going to publicly name anyone but they're people that I've seen repeated times who appear to be vets to me. Of course I might be wrong.
I agree with you, but I also think you shouldn't take every round very seriously.
I don't support trolling and I usually leave the server if it becomes really annoying. However, I think it's not that bad to have a few rounds where people do what you described.
There aren't many games in which you can do crazy things like that and have so much fun. "Helping" the enemy Sith who didn't attack you by kicking your clone teammate (you should know what I'm talking about
),
charging with a rocket ARC and blowing 'em up...
What I'm trying to say is that it's not necessarily bad to have a "crazy" round every 15 or so "serious" rounds.
It can be irritating to some players, but (what you call trolling) is not done intentionally to make others angry. It's done because it's fun.