Canadian Iranian: “I feel betrayed”; waves of migrants endanger Western societies

How do you explain this Western multiculturalism?

Thirty-seven years ago, before the invasion of Iran by Islamic Sharia law, and before Khomeinest regime exported their political Islam to the world, Americans and Europeans embraced multiculturalism inclusively as diverse society. But, after, they allowed excessive immigration without stipulating enough integration into their societies, which undermined the national identity by creating a mismatch of ideologies, breaking down social cohesion. In turn, this has caused a degrading of public trust, and any criticism about it now is labelled racism.