This post is written for the religious people who stop by. I've gotten sick of a number of atheist stereotypes you're often fond of passing around.
1. We didn't become atheists so that we'd be free of a moral standard. Many of us ended up starting our path to atheism out of moral disgust with our churches, preachers, etcetera. I stopped my church attendance when a new Sunday school teacher openly condoned the pointless suffering known as Hell. I had thought everyone there went through a looser interpretation to dismiss the torture chamber in favor of, at most, a temporary prison with a finite sentence. And worse, he saw nothing wrong with categorically throwing non-Christians in there. I left because I couldn't tolerate God being described as a fascist with such random, arbitrary, tribalist standards. I had already known a number of non-Christians who were decent, upright people. The idea that he and his diabolical interpretation of God would be just hunky-dory with throwing them in a lake of fire for no reason strained my credulity. I left, convinced he was a empty, heartless Satanist. (That was before I met a Satanist online who chewed out a Christian white supremacist by telling him her interracial marriage was all about love, and that his idea of women as baby factories was appalling.)
2. We don't necessarily hate God. That's primarily reserved for maltheists, those who believe God exists and that he's evil. Atheists regard him as a fictional character. Different versions merit different emotional responses. The merciful, compassionate God I believed in is still okay by my standards, if more than a bit confused. The tyrannical, genocidal, slaver god of the fundies merits nothing but contempt. Atheism just means I'm relieved to know the latter is highly unlikely to exist. Unfortunately, there are people who hold that monster up as a moral ideal and make sloppy attempts at justifying acts that are clearly evil.
3. We aren't wild, selfish hedonists. I plan having a decent life span to enjoy. Going out and doing crazy criminal things for thrills is going to cut my short time in this world even shorter. I'm probably blander than you are. That's one reason. Mostly, though, we're a morally inclined bunch who don't want to bring any hurt unto others. Christians didn't invent the golden rule. It's a part of who we are as social beings, and necessary for an orderly society where its members can feel safe. Please, no apologetics to create special loopholes in the principle.
4. We aren't rebelling for the sake of rebellion. Yes, there are teenagers who go through stereotypical emo phases like that. No, we're not like those who can't articulate a good reasons to be skeptical of theism. If you'd stop being so closed-minded and repeating rationalizing stereotypes and discuss the merits of theism, you'll actually get something from us.
5. No, we aren't hurting. Some of us have had bad experiences in life, but pretty much every atheist I know arrived at the position through logic, not a knee-jerk response to a tragedy. Theism is a positive claim without good evidence. It's supported only by fallacies and wishful thinking. That's how I think about it. It'd be nice if there was a compassionate being protecting us and such, but we're not about to take wishful thinking as evidence. Without evidence, your belief in a happy afterlife won't comfort us, even if we haven't learned to cope with the inevitability of death, anyway.
6. Yes, we can say without equivocation that Hitler, Stalin, and Pol Pot were evil. Hitler was a genocidal, maniacal fundie. Stalin killed and gulaged people for having different political and scientific opinions. Pol Pot committed mass murder for the sake of some agrarian utopia pipe dream. We have pretty firm moral principles against killing. The fact that the latter two were atheists has about as little to do with us as Catholics have to do with the ancient Mayans, who believed in gods that demanded blood sacrifices. Stalin and Pol Pot may have been atheists, but they acted in the name of absurd utopian practices and believed the ends justified the means. You'd be extraordinarily hard pressed to find one among us who support any of those figures. And if you do, tell me so that I can flame them.
This post is subject to expansion.