Immaturity on Libertarian forums can often be solved by delivering a swift dictatorial kick in the seat of the pants. Different strokes for different folks ;)!
What these kids don't realize is this forum isn't going to clean up their mess and hide it. Welcome to the real world, you left the sandbox behind. It's out there now and forever. So 30 years from now, if someone wants to investigate them, there is their poor behavior for all to see. Even their own kids kids will be able to read their rants and be embarrassed by them.
The courts can hide a juvenile record, but the Internet has no such charms...