Since differences create conflict, why not let like-minded people form their own laws?

If groups of like-minded people feel that the current established laws, be it state or federal, do not reflect their will, why not let them form their own laws or lack thereof to govern their own like-minded communities? The current differences are only causing and increasing conflict and animosity.

A lot of places in the U.S have already established like-minded, segregated communities. Since allowing this would create more choices for people, resettlement would surge.

This is similar to the Cantons of Switzerland only more split up.