But unfortunately they joined with the sole intent of causing trouble
Yes, I agree. It was bad behaviour.
with the goal of destroying the forum
I think, for most of them, at least, it was just meant as a short-term prank.
.... unfortunately they did a lot of damage
Please don't think that I am condoning their behaviour, because I think that causing trouble, using bad language, stirring people up, etc, are unacceptable.
However, young people sometimes do silly things, and this was a prank. It was short-lived and things should now be back to normal. A joke, played on us, by a few youngsters, should not be able to do such 'a lot of damage' ~ and I have to wonder why it has???
