Personally, I believe that it's just typical left wing hypocrisy. I know that not all atheists are lefties but most are.
Hypocrits like the N.O.W. who are only FOR Democrat women, or the NAACP who only promote and protect Democrats blacks, or anti-war people who only protest wars when the GOP is in power. Atheists only care about percieved threats when those threats come from Christians.
Atheist activists are vile people. They need to spread hate and destruction. This feeds their need for attention and gives them personal satisfaction. They are a disgusting lot.