I think you may be conflating things a bit. Atheism is simply a lack of belief in gods, it doesn’t automatically come with a particular worldview. Worldviews are much more broad, as the name would imply. They encompass a set of values and assumptions about life. Atheism doesn’t prescribe how someone views politics, morality, or society. Those are shaped by other philosophies like humanism or existentialism.

I agree that no one is immune to the dysfunctions of collective action, and atheists can certainly fall prey to the same human errors and biases that affect any group. However, attributing those flaws to atheism itself misses the point. The fact that individuals with different beliefs, whether religious or non-religious, have varying behaviors doesn’t stem from atheism as a ‘worldview’—it’s part of the complex nature of human society.

Criticism of specific worldviews is valid, but atheism as a simple lack of belief in gods doesn’t operate on the same level as belief systems that come with doctrines and tenets.