I just wanted to point out that we humans already made life more fair. Of course it could be better and it sucks when people are mean, but at least we mostly don’t just beat each other to death suddenly or dueling on the streets any more.

You list other animals as positive examples and then say yourself that our life wouldn’t be like other animals.

When we were still small hunter gatherer groups, individuals who made problems or simply weren’t strong enough or a bit sick would cold heartedly be left behind alone which was a death sentence for early humans sooner or later.

It can always be better but I think pure nature is even less fair and can be absolutely cruel. We are very spoiled of our cultural progresses living in a huge bubble where everything is pink and fluffy compared to “real life out there in wild nature”.