I see the prime law being in diametric opposition with human nature

Further than this at this point, I just got the idea that In theory this sounds great. However, I see the prime law being in diametric opposition with human nature in that, that is, if you break it down even further it is an eye for an eye. Therein having the potential to incite war on a global scale the moment someone murders someone else. The point being, say person 1 is killed by person 2, person 3 to protect themselves from person 2 kills person 2, it’s a chain reaction waiting to happen as far as I can gather.
C.R.