Why do contributors delete their own posts?

I know of one who not only deletes his posts, but then demands I delete my post which quotes him.

Erik, I can probably guess who that might be. Lol 

jl35, it’s not for me to inquire. It’s odd behavior. 

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

I don't think its always or even usually for nefarious reasons.  For me, I might get a little ticked off and send something off and then immediately wish I hadn't.

Or might attempt to give advice and just after I push post notice someone else has answered given much better advice.

I have not noticed it to be a pattern with anyone.