I'd say that the messages button should be one of the ones to go if ever the need comes, since we've go a link to our messages right under our name, above the unread posts link.
I'm asking because a user suggested locking it because he didn't care, and the next moment, locked by a mod. If that's the case, is it allowed now to lock threads just because I don't like it or I don't care about it?
Look at the thread. Most of the posts were just spam about how no one cared.