> You would have to look at the data of people living in areas where Immigration just begins/recently started to see if they are happy about it

I live in Munich. Aside from exorbitant rents caused by politicians ignoring housing issues for decades, we don't have a significant problem w/ immigrants and refugees. We do have a couple Nazi groups (two different Pegida groups, plus the "old" NPD nazi party plus the AfD neo-fash) with maybe two dozen people on the streets, but no one except Antifa gives a flying f..k about them.