The belief that you can be friends with those who share opposing viewpoints to your own is largely based on ignorance. The fact that they're not your allies and would sell you out to the authorities or to the mob should your views or actions ever violate their sensibilities is an inescapable truth that you must be cognizant of when dealing with outsiders. Should they ever catch any flak by those who are Ideologically related to them due to their affiliations with you and be forced to choose between a member of another tribe or their own, they will almost certainly choose the latter. Tribalism is a alive and well.