So he completely ignores evolution, which is the one thing …

So he completely ignores evolution, which is the one thing an atheist/materialist has left?
From an evolutionary point of view individual well-being is completely irrelevant.
And when it comes to collective well-being, the strongest taking everything for themselves is a much more beneficial for the species long-term than feeding the weak.
Most of the time (when dealing with an outgroup) well-being means destroying them and taking their resources.