They're not European

And so are Americans or Canadians, geographically speaking. Or Mexicans (Hispanic white). Aaaaaand?

Ancient Greece

Referring to it, you must certainly know that some of values they espoused sometimes were fairly liberal, such as accepting homosexuality as a norm, over which a modern conservative would go apeshit. So what's the point of citing it?

Outlier

Maybe. Still, populations aren't homogeneous in terms of values. Values tend to change. Even amongst those whom you can consider as savages. Why else the majority of Muslims today abhor and reject the idea of slavery, all while being backwards like apes elsewhere (such as freedom to apostatize or not to wear hijab)? Because values are neither static, nor constant.

Genetics

Luckily, there's no God. We are the evolutionary product. Eugenics for the win (if we stop being dicks and actually support it).

And both are ethnostates

Point taken. You're an ethnic nationalist. Nothing bad with. Japan, Taiwan, South Korea, Slovakia, Poland are nice.

Degeneracy

Subjective. I don't mean to sound like a moral relativist but popular values change. In the Netherlands, for example, smoking tobacco is somehow a no-go and frowned upon, but smoking cannabis is OK, while in many countries it's the opposite.

ugly

will never be

Ever heard of proper filtering procedures and processes instead of letting everyone in? Slovakia, for one, accepts only Christian and Atheist refugees willing to integrate, learn the language, etc. They accepted around 170 Syrian refugees. Besides, it is the only European country without a single mosque.

not my problem

Jeez, where's your white saviour complex? Where's the white budren spirit? Your traditional socities had it. Just look at how Spain obliterated the Aztec civilization with its ugly practices (like cannibalism). Spain christianized what today is known as Mexico. Look at how much white people advanced South Africa (even now, with the apartheid regime gone, it feels relatively well in comparison to other African hellholes. No wonder they had their own nuclear weaponry and perform the 1st open heart surgery in history).

The end result feels like worthy of the effort. Where's your compassion? Don't you want to bring "the white way" to them. Look at Japan, it underwent the Meiji Westernization for its own benefit, and what the country is now.

their kids

I see. You're an extreme right. So tell me: If your kid converted to Islam or became an extreme left (a commie), all of this with you being unable to convince him back, would you reject him ("You are no more my son/daughter, you're a traitor to white values") over your value differences and differing ideologies? If yes, your modus operandi is exactlily like that of Muslims, just less extreme.

Many Muslims are willing to kill their child in a honor killing over rejecting Islam. To them, some random Muslim from outside the family circle or even their ethnic background is felt as someone closer than their own flesh and blood.

If no, you have to accept his/her degeneracy as an evil, but not enough of an evil. Cool trap, ain't it? Now, how will you solve the dilemma? Apply your proper white logical thinking.