How is Yahweh not immoral?

[Darkstar]

No, but how does a God atone?

You could say that his easing of restrictions and (relative to the OT) conciliatory manner would constitute some form of atonement, even if "I'll never be a murderous psycho to you again" is admittedly poor atonement.

But didn't he plan to ease them all along? He never shows remorse, but sometimes regret:
Genesis 6:6-7 The Lord regretted that he had made human beings on the earth, and his heart was deeply troubled. 7 So the Lord said, “I will wipe from the face of the earth the human race I have created—and with them the animals, the birds and the creatures that move along the ground—for I regret that I have made them.”

And about never being a murderous psycho again:
Genesis 8:21 The Lord smelled the pleasing aroma and said in his heart: “Never again will I curse the ground because of humans, even though" every inclination of the human heart is evil from childhood. And never again will I destroy all living creatures, as I have done.

Now, we know how people like to bend words in the bible, so wouldn't "as I have done" imply that he could use another method? Not to mention that this only applies to wiping out all things. He can still kill 99% without breaking his word. (Not to mention that this was prior to many other OT genocides that he ordered...maybe using people to do his dirty work is a loophole?)