We inherit a lot of our code from friends, family, culture and experiences. What we do with that inheritance is down to us. We take final ownership. Sometime people do choose to discard some or all of what they inherit. Its not common but it does happen so one cant say that personal choice does not come into it.
But if as you say, it is not common to discard the principles handed down to us, then that helps explain how each generation largely repeats all the mistakes of the previous generations, and how slow humans are to learn and evolve, and how, generally, we are enslaved to our past.
It is precisely, I think, the rejection of principles in favour of a guide to life that will lead to a faster evolution towards a human world of no war. Therefore we need far greater numbers who will discard their principles of inheritance (which were in turn inherited from the prevous generation), and choose for themselves instead an alternative guide that is not written down in stone because it cannot quantify what action or non-action should be taken.
Principles make us a hostage to our past. We need something that can deliver us into the present...