If there was a thread that I regret making
THEN YOU SHALL FOREVER LIVE WITH THE SHAME!
Nah, on a serious note, what
@NPT and
@chance said applies to most cases. The reason why you can't delete topics is because it basically means everyone who replied to them wasted their time, and it's
very frowned upon... same with removing post contents by editing them. This doubly goes for off-topic and other non-programming topics. We're not a secret society that tries to mind-control our subjects, and we're not babysitters either, so if you make wanton inflammatory or stupid statements, you need to be prepared for the consequences. Sort of like real life except everyone likes binary jokes
I assume you're referring to a programming topic (retitled "ignore"), though... and that's not a big worry. Activity in Q&A is so high your topic will be
practically lost forever within days if not hours.