User blog comment:BertH/User rights updates for Forum and Message Wall/@comment-13520889-20150123224256/@comment-452-20150123231221

You say "bad few" as if people abusing the ability were in the minority, but in my experience, there have been more users who abused the ability to remove threads and replies than people who removed threads and replies for valid reasons.

This update only partially addresses users who think they "own" their messages walls: those users will still attempt to remove messages they don't want, but at least they will not be able to remove the again after an admin restores them.