Change that to "... the innate right of every animal to try to kill what it can and take what it wants" and you're spot on. And that of course is a big advanta

Change that to "... the innate right of every animal to try to kill what it can and take what it wants" and you're spot on. And that of course is a big advantage of law (and custom): We don't get into these contests of brute force quite so much.