Moral judgment is not the monopoly of the believers alone, in spite of glaring exceptions to the above among the believers themselves.
An Atheist is just as much a social being as a believer. He or she is just as aware about the consequences of breaking social order, and destroying the principle of reciprocity, as is the believer.
I find it hilarious that believers, usually busy fighting against the flavors of their classification (Shia-Sunni / Protestant-Catholic, etc.), manage to feign a sense of unity when their beliefs are confronted by Atheists.
***Moral judgment is not the monopoly of the believers alone***
Interesting statement. Upon what, then, does an atheist form morality?