All of human history is selective breeding. The lunatic desert people in the Middle East where 1 rich guy has 10 wives and 40 kids is one way of doing it. And, thankfully, post-Magna Carta cultures and ones with greater-female-human-autonomy cultures have another method of selective breeding. And what you just said about broad human nature supports my original statement because fundamentals of human nature change and not just from environmental conditions but inherited tendencies.
Side note: what was so great about Spartans? They seemed like slave-dependent authoritarian assholes that disappeared in a flash.
What you lack in reading comprehension you make up for in smarmy quips.