not true, ante - we all do things when we're hurt, angry, upset or threatened. if anyone claims they don't make mistakes.. well, they're either fibbing or deluded. good grief, man, even I make mistakes, for heaven's sake!
so, rather than think of yourself as unredeemable, accept you've done something wrong, and learn from it.
i won't speak for anyone else here, but i accept you. what you did was thoughtless and annoying, but you're not just what you do (otherwise i'd be like the picture of dorian gray, let's face it). if you're lashing out cos you're hurt, talk about it. make this incident the start of you trying to work with the horror of being alive, rather than another reason to lash out.
as you said, people here were sad that you said you were leaving. hold that thought.
Vivi