Wow, where do I start with that?
If we don't learn to live together, cooperatively, death and brutality win.
You live in a dystopic nightmare that I read as fantasy as a child.
The people think what they are led to think.
http://classes.dma.ucla.edu/Fall07/28/Engineering_of_consent.pdf
http://fritz-springmeier.dbs2000ad.com/
There was no 'mass immigration', those folks were bombed from their perfectly comfortable lives by miserable psychopaths that currently engineer the consent.
I've already agreed that folks will self segregate, there is a mute function if you need another level of that, but to cut folks off into smaller herds is to make them easier prey to ideas they have no idea even exist.
...no. If we are all forced into the same community that's when you run into the conflicts.