Have you read any Lee Kuan Yew? I have. He has very specifically said he learned from going back to London that having a multi-ethnic population erodes trust. That's why he realized he needed harsh/authoritarian laws. Did you even read my comment before jumping to reply? It seems like you just wanted to have a "gotcha" without even reading the words that I had written.

Multiculturalism No consequences for anti-social behavior Maintaining orderly streets

"Choose two".

USA (driven by progressives taking control of urban politics) has essentially chosen the first 2 and eschewed the third.