Kulturkampf

[Uncle]

this example was used in order to avoid the example of letting a bunch of muslims settle in your land, become the majority population, change the laws, and execute the former occupants for being infidels, only to discover that they are inferior at upholding all the ideals the former society held to, due to their incurious adherence to tradition which won't allow them to innovate, ask questions, or learn to the extent of the former society

which goes back to the original point of deportation not being an admission of inferiority, but to preserve what your culture perceives as superiority

I don't see how this is not an admission of inferiority. If your culture is so weak that it will fall to anyone who joins it, hence the need to police it pre-emptively to protect it from its superiors.

Your Xenomorph example is the same, you're saying they're superior. Desire to stop free trade or innovation or anything else is the same, a fear that you'll no longer matter, etc.

because you can be superior or inferior in different ways, and inferiority in one aspect does not automatically prove inferiority in all other aspects

If your culture is so weak that it will fall to anyone who joins it

the argument isn't "anyone" who joins it, it's about sheer numbers and physical force supplanting a culture which might be better than the other in every other aspect; nor is it about "weakness," that is changing the terms when the conversation is about superiority vs. inferiority

if I believe in feminist ideals and then a bear kills me, this does not prove that the bear's philosophy regarding feminism is superior to mine, simply because he overpowered me; you don't get to say "hah, looks like your precious feminism isn't an effective ideal at all, if you can still be murdered while adhering to it"

you are essentially saying that one man who has somehow stumbled upon the best set of philosophies in the world, primed to transform the world into a utopia if they could be adopted by everyone, actually has bad and terrible inferior ideas because 500 barbarians showed up at his doorstep and killed him without even asking to hear those ideas

which, in an alternate universe where he isn't killed and instead sees his ideas gradually adopted, suddenly become the best, superior philosophies, even though they are the same exact philosophies in both scenarios