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the law of nature is really much more merciful than ours...

Absolutely. The law of nature has an aim. But human's behaviour may be aimless. Like wars, bombs etc.

Chimps have wars.

Think about the evolution. People have much similarities with chimps.

we are animals and many animals are territorial, not just predators squirrels are territorial, they will go at it. Corals are having extraordinary wars with one another.