Your context changes nothing: it's just one long "the ends justify the means" or "that's the way it is" and fails to address any of the ethics of the statements being made.

>> "When it comes to immigration policy, a nation has no obligation to discern incoming immigrants true views for compatibility."

Why? All immigration systems I know take the person's views into consideration (for obvious reasons).

>> "They can set whatever policy they want regarding who to let in. If the widespread views or cultural traits of some population renders immigration from that population more risk than reward, that is to no fault or demerit of the host nation."

They can't do that without disregarding the equality of all humans as a universal principle. And no, it very much is the fault of the nation/people making a discriminatory policy, not the fault of those being discriminated against because of that policy.

>> "Immigration as policy is exclusively for the benefit of the existing citizens. Anything more is purely at the courtesy of the host nation, to be revoked at will."

Is that an ethical/moral position? Does that conform with belief in universal human equality?

You just made a bunch of statements about what they can do and failed to address if the behavior is moral/ethical or otherwise... so it isn't even worth engaging with in a discussion since you just made a bunch of statements with no ethical rationale surrounding them.

All you're saying is "this is how it is or should be" which tells me nothing about whether those positions are discriminatory/unethical (but it seems clear they are unjust and arbitrary discrimination and unethical).