I agree that a lot of people live a life that does no good for them, other people or the planet.
But that is only a good reason to promote God as a useful fiction, not an argument that God exists.
You - like many theists - assume that because atheists reject god as the source of morality they reject morality itself; but that is not so, at least not for the vast majority of atheists (e.g. all the atheists I know!).
I don't know why atheists do not conform to your stereotype of rapacious bestiality. The reason I'm not a rapacious beast is that I don't want to be. I can explain that using biology an evolution, but I can't justify it logically. I want there to be more peace and less suffering in the world, and if I am lazy about it I try not to add to it! And it's not because I am borrow my morality from you theists - if you ask me, the only good parts of theistic religion are those bits that ignore the gods and emphasise charity and empathy towards other people.
James1:27 Religion ... pure and faultless is this: to look after orphans and widows in their distress and to keep oneself from being polluted by the world.
i.e. Nothing to with god at all.