Why do contributors delete their own posts?


A significant contributor who shall remain unidentified deletes posts shortly afterwards. It’s not done with the intent of correction, but for the purpose of limited viewing. I wonder what rationale warrants this behavior. It certainly not for the benefit of providing context for later viewers who might want to learn from the thread. 
128x128celander
I know of one who not only deletes his posts, but then demands I delete my post which quotes him.
Maybe they figure that's they way to communicate around here when what's said isn't on the up and up?

I had a couple of co-workers who'd say things under their breath that weren't nice but could be heard if you were close enough. The very action of saying it made them feel big as if they accomplished something.

They spent a lot of time in the supervisors's office.

All the best,
Nonoise