Another considerable thought comes to mind: Should the person correcting/answering someone where they're mentioned should be deleting their content?
If this is the case, then how would they avoid it? This will also most likely not apply to every board.
I think it can be avoided if you reply to other people posts, not only one user.
If you reply to the @OP, reply to the troll and then reply to other user, such post high unlikely to be deleted. But, the moderator can still ask to delete a part of your post though, honestly I have never experience in this situation.