Individual human welfare? How on earth can you get that out…

Individual human welfare? How on earth can you get that out of an atheist worldview?
In the material/atheist/evolutionary world there is nothing that points towards Individual human welfare being "good".
That's just wishful thinking. All those atheists seem to be swimming in the sea of metaphysics while pretending they are flying.
On top of that, Harris is most certainly a collectivist. How much is individual human welfare worth once it interferes with the "greater good"?
I'd be much more excited about listening to him if the chances that he's just having completely unfounded ideas based only on what feels good wasn't 98%