These are the exact same arguments people make against immigration and diversity. I do not want this far-right drivel on HN, flagged.
You might want to look at the HN commenting guidelines. Namely you should avoid such uncharitable interpretations and show a bit more curiosity.
I don't think the article proposes that a community should not accept new members. On the contrary, it critiques the breaking of communities.
Migrants or refugees have to find a new community because their old one was broken for whatever reason, be it war, financial troubles or something else. So in that case, that first breakage of community should have been prevented and the community preserved.
[flagged]
Maybe, just maybe, there's some inkling of truth behind what your political enemies are saying, and you can carefully acknowledge said inklings and even gasp integrate them into your own worldview, if relevant?
Nah, they're probably all just evil and/or stupid for no reason at all. That makes a lot more sense.