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. 
celander
Conspiracy theories among trolls, argued about by trolls.  Spelling mistakes by trolls, corrected (in the spirit of educating) by trolls. Disappearing trolls, egged on by trolls... and yet the hobby is shrinking. Hmmm.
1. OP recognizes the error of their logic. Buzz wore off.
2. OP is only interested in immediate responses. Anything well thought   out is too much to absorb.
3. milpai had a point too.
If the point of posting is to contribute to a thread, then why delete the post? Are their actions regarding their contribution is that such posts are somehow time-sensitive and having only limited value that warrants deletion thereafter?

I’m not interested immediate responses; those who post and delete their post shortly thereafter are only interested in immediate responses.