Resources are not unlimited.

We started out as animals with nothing but our bare hands and what we could do for ourselves with them. If you had a disease or were treated unfairly, you just died or were otherwise out of luck.

Now, we have economy, government, healthcare, insurance, technology, etc. etc. But these things are not unlimited. Someone isn't always going to swoop in and save you when something goes wrong. If you're treated unfairly and there's no retribution, it isn't always because someone is racist or sexist or whatever buzzword you can come up with. It's because we live in the jungle. Anything can happen. If someone or something happens to rescue you from it, you're blessed. But if not, you're just like everyone else. When it comes down to it, we're still animals in the wild.