Is there a competing theory you find more compelling? "I don't know what happened" is fine, but if there's something else I haven't heard of that could explain the facts as we know them I'm interested in learning about it.
We experience a world through the senses. We have no other way to experience any world that may or may not exist. The world experienced through the senses is apparently consistent, and if we do not deal with it, we have bad sensory experiences, or cease to be experienceable to each other entirely. So, since this is the only world we can interact with, and how we do so matters to our happiness, all we can do is take this world on its own terms and deal with it.
Yeah as a culture war target I don't have anymore choice in being a part of the war than Ukraine does. I don't get to opt out, and people can say, "Just don't fight the culture war, fight the class war," and it's like, dude, you're telling the majority of your potential allies to fuck off and die so you can charge a pillbox solo. It ain't gonna go well.
We should help everyone, even if it means "bad people" can take some from the system.
We should not help anyone but a tiny fraction of people so that no "bad people" can benefit from the system.
Personally, I don't really favor making the world that much worse to avoid some spoilage. We can do better than hurting a lot of people so we get the "bad" ones, who in my view are responding to material conditions, neurology, and history.
I don't know that any particular person said it, but I agree with the notion that the first sign of civilization was a human corpse, with a femur that had been broken, and then healed. A human with a broken leg is pretty screwed on their own. Someone had to help that person get food and water long enough for it to heal. Civilization is when we help each other fulfill our needs, and that's beautiful.