Look I've had countless posts just disappear on me. Seriously I've lost track, it's that many. And from what I've read other posters have had similar issues.
It isn't an isolated issue, it happens all the time.
And again from other posters as well as my own experience, other forums aren't like this at all. It just doesn't happen. Except here.
Maybe you could make up some stats that keep track of why your content gets deleted. For example,
PIO - Personally insulting others
BAW - Bickering after warning
ALD - Acting like dick
TC% - Trolling content %
Just off the top of my head...