Atheism and Ethics

[Angrboda]

There are plenty of incentives for behaving immorally.  That's why.

Yep, agreed on that. But there are also plenty of incentives to not. Just because there are incentives doesn’t mean we will choose them. Sure, we could; and probably will in some situations, but the absence of a belief in an objective standard isn’t what does that. I have yet to go on a theft spree since becoming an anti-realist and can’t see it happening. If I were clever I would get away with it, still don’t see it happening, because I don’t want to not because there is some objective standard saying I should not

I wasn't arguing that we necessarily would behave immorally, only that the reasons not to do so become purely utilitarian, in which case, behaving immorally is often the better choice.