I don't doubt that there are anti-theists who do stupid things in the name of their religion/philosophy, whatever you want to call it. The cases you mentioned seem horrific, Brandon, and I can guarantee you that any mainstream antitheist or atheist would denounce it give the chance. The problem is, we don't have any sort of mouthpiece from which to actually give statements.
There is no atheist church, there are very very few atheist political officials (none on the national stage that I'm aware of and in some local areas there are laws that prevent nonbelievers from taking office), so there really is no central authority that has a public venue. All I can really do is give you links to communities which atheists and anti-theists frequent so you can see the content of their character for yourself (if you're interested). I find that when it comes down to it, atheists and anti-theists are pretty much like everyone else. I haven't experienced more or less nastiness amongst them.
I think also, at some point, in this discussion what exactly was being said got confused. I wasn't trying to denigrate religion and relegate it to a lesser position in life. I think religious thoughts from time to time even though I'm a self-proclaimed agnostic. I wonder what it's like when you die, I am concerned about morals (though from a philosophical viewpoint), and every now and then I do think of the concept of god as the master clockmaker that was popular during the enlightenment (especially in relation to mathematical constants oddly enough).
What I took issue with was the comparison of science to religion. I'm not saying that the ways in which science is used to attack religion should be encouraged, I don't believe that at all, I just think it's not fair to compare the two in terms of solidity. Religion is a subjective experience for most, it's a personal thing, but what we need as a society is something rigorous and objective to help us establish a group of agreed-upon facts to make policy and day to day decisions with. I am discouraged when people substitute their superstitions, religious beliefs, or other types of magical thinking for hard empiricism.
To be perfectly clear, I do not believe that science is superior to religion in all things. When it comes to establishing agreed-upon fact for decision making, I think it is. When it comes to understanding the routine processes in the world around us, yes. But science cannot comfort you when you think of your mortality, it cannot explain why humanity is here, and it certainly can't be applied in every situation. It's far too complex, time consuming, and rigid. Religion is a very important part of the majority of people's lives in the world, and I wouldn't change that even if I could.