No state in the world today, nor in all of history, has that view. Nor is it, on the face of it, even really coherent. There is nothing to be said about the "All" of the others. Only that we don't owe them much.
How is that not arbitrarily discriminatory on its face?
A nation discriminating against non-citizens is not arbitrary, it is the core feature of the citizen classification. What you are implying is that the concept of "citizen" is unjust, therefore the concept of countries and borders are unjust. Of course when its put into these words few people will cop to this viewpoint. That's why there's endless obfuscation in these discussions, to avoid articulating the plain truth of your views.
Do you believe that if a country can discriminate or harm non-citizens, then it should do that? Is it morally/ethically correct to treat non-citizens less than other persons?
Do you hold beliefs that apply to all people regardless of what group they come from or only your own tribe?
It really does simply boil down to whether or not you believe all humans should be afforded the same basic rights and considerations. The "citizenship" argument is essentially a legal loophole to claim that whatever the law says is the moral/ethical path, which it is not.
Laws can be (and often are) immortal/unethical, so grounding your argument in what is currently legal or not is a bad look (as it has always been); just ask former slave owners about the morality/ethics of the law, and see where that gets you.
Your views about individual autonomy etc are, while probably good rules to live by in your personal interactions, not really relevant to migration at the population level.
But okay, let's get specific then. Which country are you talking about and what views?
Also, we are not saying the same thing at all. I am making a claim, which is true and very very visible, that when you allow large scale migration the country being migrated to begins to resemble the country being migrated from. And this is unsurprising. How could it not? There is no magic passport stamp that updates someone’s views and attitudes upon entry. As a meta comment this whole debate is really fucking strange because my position is the nominal position throughout basically all of human history, and yours is an extreme version of the blank slate hypothesis. Strange to encounter, to say the least.