Why 'should' atheists be moral?

[Esquilax]

You can't just expect everyone else to sign that agreement while you go "but I'm the exception."

This is exactly what I'm asking, why should someone not let themselves be the exception? Yes, it would ruin society if everyone said this but if you know everybody else isn't going to say this, which is how it is in out society, you can benefit from being the exception. Religious people would say they wouldn't do this because of God, what is the reason an atheist can give for not doing it.

Do you care about people at all? If so, there's your answer. If not... well, you've already baselessly locked us out of using pragmatic concerns, so...

This is such a weird, inconsistent question you have. Theists might say not to be immoral because god, but I don't see you asking them the same questions you're asking me when I give you a secular reason not to be immoral.

Oh, I shouldn't be immoral because of god? Why not? Why shouldn't I just be an exception to that if I know nobody else will, so it benefits me?

... Well, why aren't you asking that to them, Vincent? Why are you pretending that "because god" is an actual answer to the question you're asking me? It's not; the same question applies to the theists. And they can't use hell as an answer to that question either, because you've discounted prison as a reason I can use, so obviously you're not content with simply referring to the consequences of an action as a reason.

Ultimately neither side has an objective sure shot answer to this question, but at least the atheist side appeals to things we know actually exists. And might I say, the inconsistency of your questioning, the focus on just pushing it on atheism, is very suspicious.