Cavemen probably had better moral barometers than tbh, what with the fact that most Eurosians have neanderthal genes. Doubt most cavemen would want to eradicate the leadership of an enemy tribe all because of a petty grudge built up over a hundred years. Doesnt stop me from wanting to inflict that apon the seventh day adventist, this isnt even family policy thats all me.
Also at best with the ground water thing and cows youve made me appreciate how fucking useful chickens are, creating constant source of nutrients and you can eat em fucking a.
Also I suspect the reason vegans are on average healthy is less cause their diet is inately better but more cause they are more focused on that in general, but I dont really care.
As fore the last one, whatever caused such a scenario its safe just go with it and make synthetic human meat for em.