There are mild-mannered crocodiles that don’t mind having their hands bitten off, and there are ferocious crocodiles that are willing to kill you if you enter their territory. The type of crocodile that has to spend regular dense time in the dry season, etc. is gentle, and this difference in character is inborn. src
In an environment where they can secure their territory, if there is a mix of ferocious and mild-mannered ones, the mild-mannered ones will be weeded out and the ferocious ones will remain. However, when they are crowded together by environmental factors, it is likely that if one side is mild-mannered and does not mind being harmed, the total damage is smaller and they are better adapted as a group than if the two violent ones fight each other and hurt each other.
It is interesting to replace crocodiles with humans.
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