I skimmed through this 2017 book by Douglas Murray. It's interesting, because it's a very Euro-centric view of migration, but you see parallels and contrasts with the concerns in the US embodied in the Trump administration. Some points which stuck out to me:
- the decline of Christianity
- the loss of standards by which to judge (adversely) the Muslim immigrants
- European guilt over colonialism and German guilt over the Holocaust
- governments were always behind the curve in reacting to increased flow of immigrants
- immigrants as violent, crime-ridden, and not integrating into the society
- loss of faith in Europe
- almost total ignoring of US trends and experience
- perspective that societies are unchangeable, that Europeans don't change when they emigrate, that Muslims don't change
- perspective that European culture/society is very vulnerable to change and loss of old historic values
- alienation from modern life, art,
- the author's perception is that migrants are unskilled, unlike the US where several groups are more highly skilled than the norm for Americans.