I do want to put some balance here. I think you are only partially right here, to share there have to be two willing parties, but just as many times the pakistanis or muslims or any assorted recent immigrants dont open up or mix in, just as much there are people who are not receptive or only want ppl to mix in at terms that are dictated to them. Or in communication rather than being open minded and willing to learn, that is an opportunity for them just to start attacking the person and trying to prove him wrong.
There are people who no amount of communication and sharing will help. years of bigoted upbringing, ingrained prejudice and racism, xenophobic views etc are too much for casual conversations to make a chip in, and that is true for all involved.
That being said, people should try and integrate more, but integrate more with the right people unless they enjoy hitting their heads on rocks..because some people would never understand..again..on all groups involved.
so yes..SHARE people. both groups, the recent immigrants, and the old immigrants (and native americans too)