First, let me explain why we don't normally entertain these requests.
1) They cause enormous work for the Staff, who are all volunteers;
2) It creates confusion, disconnects, dead links and just general chaos, in the threads when posts are deleted;
3) It's why we allow time for the original poster to edit his\her own comments, in case he\she says something stupid or otherwise; and
4) If we do it for one, to be fair, we have to do it for anyone that asks, and we just don't have the time or resources to read, cull, rebuild and repair those threads.
Secondly,
Before anyone here considers going to all the trouble, you're going to have to give us a real good reason (National Security comes to mind) before it's even entertained.