Let me ask you a question in return.

If you discovered a thread on the forum where a bunch of users were excitedly talking about doing something incredibly dangerous in their 4x4s, like getting high and trying some dangerous maneuver, would you let sit on your forum?

How would you feel if somebody read about it on your forum and died trying to do it?

Update: The point I'm trying to make is that _I_ wouldn't let this sit on my forum, so I don't think its unethical to ask others to remove it from their forums as well.