Answer 1

It doesn't. That is used to argue against it because some people code junk. But, even without overloading those people will still code junk. This is a good write up of the issue from the pro overloading point of view.
http://james-iry.blogspot.com/2009/03/operator-overloading-ad-absurdum.html?m=1
I've spent a huge amount of time attempting to find a decent con view and couldn't.