[WilTimSon]

> History and data from various European nations suggest that some immigrant groups aren't able to integrate with the host society after multiple generations, and remain ghettoized with low employment and high crime rates (vastly higher than the native population, for certain categories of crime).

Does it suggest that, though? It suggests that, in the specific conditions that were presented to those groups, they turned to crime. However, we can't pretend that the previous generations of immigrants had exclusively good experiences and quality of life, even in Europe. Obviously, some countries tried their best but in the past decades we had far less experience on proper integration (we as in the collective we, no country has worked out some perfect plan on it).

In fact, certain countries specifically created neighbourhoods (ghettos) for immigrant populations, all with positive intentions. Can't really blame the migrants for then becoming "ghettoized" in such a scenario. Granted, I know of other countries that specifically did not do that and still had struggles, which just goes to show how the whole thing is a minefield, where good intentions can clash with harsh reality.