I am friends with people that have some ABSURD (compared to my own views) outlooks. I have just come to the conclusion that different people are different, and will sometimes have some polarizing topics of disagreement.
It’s healthy to speak with, and especially be friends with people whose opinions differ, even if strongly. It’s a good exercise in acceptance and open-mindedness. You don’t evolve unless you argue and learn how to make these types of relationships work (IMO).
As a libertarian, I believe that really it doesn’t matter, because the federal government should have no role in marriage, or any other similar aspect of personal relationships. This is supposed to be an acknowledgment between two people, not a couple and the government. Maybe that’s why I can be friends with people whose opinions differ on this subject, because regardless of which belief they align with, I just kinda chuckle inside thinking, “it doesn’t matter, you’re focusing on the wrong point.”