It's also the case with ex URSS atheists. Should we hate atheism because of that? Extremists are the problem, not religion or belief systems. Those who wants to impose their beliefs are the problem. Atheists included.
First, Communism is NOT atheism
True but URSS was communist AND atheist.
First, Communism is NOT atheism, they simply replace the "unknown God" for the cult or personality. Communism acts as a religion on itself... it's one of those things designed to "sort all problems of the world", that ends up doing nothing but create a load of more problems over the ones already on place.
And there you've a double point spear: If nobody imposes a belief system on anyone, then religion will die. People will "convert" to their own spirituality, eventually you get a bunch of guys hanging around about that, but not a huge network of churches or mosques or other sort of temples.
People will always share and want to share some level of beliefs, this is just inevitable. If it is not religions, it will be sects and we would be better off with religions IMO.