Your claims beg the question.

Immigration being positive is not taken as an axiom, it is backed by studies [1,2,3,4]. Facts over feelings is truly dead on the right.

If you look at the history of crime, we are living in the safest times [5]. The "homogenous countries" started 2 world wars, one of them to "preserve their culture, ethnicities, identities". Would this not support the worldview that immigration has net benefits?

Also, can you explain how ethnic cleansing preserves culture and identities?

[1] https://budgetmodel.wharton.upenn.edu/legacy-briefs/2016-01-...

[2] https://www.nber.org/system/files/working_papers/w12497/w124...

[3] https://econpapers.repec.org/article/eeelabeco/v_3a29_3ay_3a...

[4] https://www.annualreviews.org/content/journals/10.1146/annur...

[5] https://journals.sagepub.com/doi/abs/10.1177/147737081454117...

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