Everyone should have the choice to delete their content, regardless of the reason, the same way, everyone should have the choice to leave their content as well.
I for one choose to leave my posts and comments, no matter how bright or stupid, and if I'm proven wrong (which happens more than I care to admit) I give the win to whomever countered my comment, and that tends to keep the discussions going and bringing new ideas and points of view. Also, if I believe it may have been offensive (not to be confused with someone else finding anything offensive, that's their opinion) I have no problem apologizing. I would like to see more people just doing that as I believe it makes for a more open discussion.
It's pretty capable of blocking a lot of YouTube and Google bullshit. You could just use it for that.