At least for the OP. Even if the edit preserved the initial post via a strikethrough strikethrough option, so posters could read the initial post and the edited version.
So often I see OPs being pulverised by Johnny Come Latelies to a thread, when OP has long accepted they were wrong and done a complete 180 degree about turn on their original position.
But latecomers to the thread often seem to read only the OP and - if you're lucky - first few pages, before getting stuck in. I'm probably as guilty of it as anyone and it's totally understandable with threads that run to a gazillion pages.
I think a nice little 'I surrender' flag would make a good addition to the OP.
So AIBU? 