Also, Denmark has studied this issue extensively and found that "non-Western" immigration actually imposes additional burdens on the state, costing over $10k per year per migrant. Having a young population that doesn't work is even worse than having an inverted population pyramid, and that's without getting into the qualitative damage to social cohesion and trust caused by mass migration.
https://www.thelocal.dk/20211015/denmark-says-non-western-im... https://archive.fo/DU17J