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Then why was it considered a sin for a daughter to get pregnant by her father?

It makes it human.

Abraham and Sarah were siblings. Abraham abandoned Ishmael for long periods of time. And Sarah told Abraham not to even dismount his horse while visiting Ishmael and Hagar.

There are natural laws. Lookup Game Theory.

Let’s say you’re a tree. Trees have evolved to share resources. Why? Because if a tree sucks up all its local resources, and kills it’s competition, it can no longer reproduce. It may kill every single one of its neighbors, but when it needs to reproduce, who is it doing it with?

Nature punishes greed, and a lot more negative behaviors, in the long term.