Earlier quoted context omitted.
Athiests (the community) are known for being outspoken about the damage that certian religions have caused and are causing, but they're also known for supporting the free exchange of ideas including those that they think are harmful. Atheists (the definition) aren't known for anything because atheism doesn't demand any specific behaviors.
I wonder if there have been any explicitly Athiest regimes? That is, governments based on an ideology that explicitly denies the existence of God and devalues all religions? If only we had historical examples of such regimes, perhaps we could see if they were benign or murderous. Oh what a pity we don't have such examples.
On a more positive side, I wonder if there are any of the Scandinavian countries that could be considered to more or less implement Humanism. I say that because it seems like Humanism fills a lot of the same roles for Atheists (moral system, providing hope, providing meaning etc.) that religion does for theists.