Wouldn't another moral be that not all immigration waves bring the same kind of people ? Immigrants from asia have, everywhere ( to my knowledge), brang people that work hard, have children that do great at school, and only protest to ask for more police force rather than less (true story from a recent protest in the belleville district in Paris, because chineese (sometimes illegal) immigrants were often attacked by north-africans that stole their bags, knowing they wouldn't go see the police).