Only because Superman holds back.
In JLA: The Nail (
http://en.wikipedia.org/wiki/JLA:_The_Nail ) he had force of a megaton in a single fist strike.
Let's say Superman goes one day to Gotham City and starts clapping his hands with that much force. That would be one dead bat.
One great series about Superman gone bad is Irredeemable. (
http://en.wikipedia.org/wiki/Irredeemable ) Try putting Batman against that...