I'm not whacking posts :)
I am deleting the very obvious spam, but otherwise am noting all cases where I edit posts, apart from those where I simply put some backticks in the correct place.
There is the odd time when I edit a post as someone is re-editing - I look at the time of a post to judge the likelihood of that happening, and sometimes I'm going to get that wrong.
There are some software changes going on, and there may be an occasion where that impacts an existing post. If that is the case, let myself or Matt know and we will see what can be done.
And for the record, although editing posts is okay, I really do not like deleting posts for any other reason than spam... that's why I'll usually note in the thread or email any person(s) involved - if I can.