I always find that a lot of these CHUDs who preach "law of the jungle" almost never go move to the jungle.

They can do that, but they would likely be surprised to find that for the majority of human history, people made room for so-called "undesirables" and only when we started having such grand hierarchies, that there was ever such a push to optimize our genetics like we're fucking cattle. They think that they'll wake up in Brave New World as an Alpha ready to spend eternity partying it up as a reward for being better, but most likely they will make great gammas and do menial work since they have shown a predisposition to blind loyalty to the ruling class, alongside taking great pride in being little more than cattle.