There is an argument to be made that "being forcibly shoved together with outsiders who hate them" is not what is going on here, even if it can feel that way.

First of all, most immigrants are simply looking for a better life without hating anyone. Problems arise since culture clash makes assimilation difficult. Managing this is up to each country sovereignly responsible for its own border policy. It is also a very human reaction to begin to resent those who treat you poorly, so if immigrants aren't treated well, hate will grow.

Second of all, being too one-sided (ie. "outsiders should not be forced upon us") risks missing an important part, namely why people want to emigrate in the first place. Colonial history is often brought up, but just look at what is going on today. Constant meddling in foreign countries' politics, sponsoring coups, forever wars, destabilising regions, as well as nostr:nprofile1qqs9336p4f3sctdrtft2wlqaq5upjz9azpgylhfd3dplwf005mfrr9spzamhxue69uhkummnw3ezuendwsh8w6t69e3xj7spz3mhxue69uhkummnw3ezummcw3ezuer9wct4lwjj's work on the IMF/World Bank... If countries with predominantly ethnically White European populations want to stop the inflow of immigrants, the first and most obvious action should be to stop causing chaos at the source of immigration. Of course, as is so often the case, there is a profit motive here that might hinder such action.

Blaming the desperate people who, through no fault of their own, seek to escape tragedy is a slippery slope. The West should take a look in the mirror and help the rest of the world prosper. A prosperous Africa, Latam, Middle East etc. is a benefit to The West. 8bn people in service of 8bn people. No-one leaves their country in favour of one where they do not feel welcome unless they feel forced to.