Yes it is really different from human society. You yourself admitted it. In all those cases the bird has almost no chance of survival while we do. I don't say humans would survive 100% of the time but it's a fighting chance. I don't say it is fair. Nature is also unfair.

Like you stated in many places in the world even a disabled person can survive on the labor of society, even if it is a struggle. In many sane places medical care is relatively affordable i.e. socialized. I once spent a month in hospital paying around ~200€ total. And while that is an extreme privilege some access to healthcare even if poor can be found all over the world.

Humans are capable of extreme cruelty but humans are also capable of great compassion. Especially in smaller groups.