Multiculturalism is a complete and utter failure, but don't take my word for it. Take the word of the leaders of half a dozen European nations. Islam is not assimilating into their societies... it's taking them over, and it's doing so very violently.
One French shopkeeper has been raped, beaten and robbed repeatedly. Her crime? Daring to keep her shop open in what she now calls "Occupied Territory".
Islam... the so-called "religion of peace"... yeah, not so much.