Yes this is true we must keep forum safe and the whole crypto community.
Personally, I think the solution is not just post a thread for each ponzi site (as you see there is an entire section only for ponzi site) but educate people to not join these site, even for a penny, even for one day, since there is everytime the risk to be scammed or that other people get scammed.
Probably one day
https://bitcointalk.org/index.php?board=207.0 this board will be closed
Definitely educate people will not put their fund on this kind of ponzi projects. Personally I feel so bad when find someone lose his/her fund due to lack of enough knowledge about their investment. At least if they bother to read scam accusation sections thread before doing their investment then they could get proper ideas about scam projects.
Although its our responsibility now to keep those scammers far from our upcoming forum members. This forum bears a lot of value to worldwide crypto investor. They take this forum as a guide for their secure investment. We can't let them change their thought about bitcointalk just for some fraudulent activists.
Helping one person or hundred is kinda similar for me because we are here to share and gather.