I just don't think you would say that if you saw the full range of requests we get. Some feel excessively fussy to me (ok, a lot feel that way) but some are coming from people in genuine distress.
Usually when people say that, they're putting more on other persons ("they fucked up") than they would on themselves ("but, circumstances"). If you're not doing that, I respect your position. But that's a hard karmic row to hoe. Personally I'd rather bail people out because I might want to get bailed out myself in the future.
The worst thing about browsing old Reddit threads is when half the discussion has simply disappeared because the user hates Reddit and edited/deleted all their comments. There's an awful lot of information lost there, and sometimes it's extremely difficult to find elsewhere. The same goes for the occasional deleted accounts and posts I've seen on other forums around the web by people the forum administrator have deemed "toxic" and purged posts instead of simply banning the user (I only have a single vague memory of a forum other than Reddit where a user voluntarily removed all of their own posts, likely due to the difficulty of doing so).