Europe's biggest mistake is when they generalised the Muslim world and Islam. The mass of migrating Muslims is a far cry from true Muslims, most mass migrating muslims comes predominantly from a country where the religion has been heavily culturalised, true muslims would respect their existence (Qada &Qadr) and, most particularly, their land of birth. The religion does not teach desertion or abandonment of their land; it teaches travel, not leaving. Most Muslims in Europe or anywhere else, for that matter, are deserters. Whether they are Muslims is a question they should ask themselves. Their duty lies in the promise of betterment for their land of birth. When people can't appreciate history or assimilate, it's only because their history and culture isn't in that country. People that migrate with no intent to assimilate are terrorists.