“If you want to see what this multi-culti ideology leads to, just look at Britain.”
As someone who has lived in Europe I would like to say you’re 100% backwards here. Britan and Europe in general is quite xenophobic and immigrants get very angry as a result of being stigmatized, forced to live in ghettos and unable to get work.
If you’d like a valid comparison I recommend Canada. Very ethnically diverse (except for the praries, and even that is changing) and generally very peaceful. I’ve lived there too.