> However, as a utilitarian, I'm opposed to open borders for utilitarian reasons. Having unchecked immigration would destroy the culture and institutions of the successful societies. They would lose the very culture and institutions that made them successful and attractive to immigrants in the first place.

I have to steelman this position with something now:

If you have a country which accepts broad civil rights for sexual minorities, and you have a large influx of people coming into your country who prefer few or no civil rights for sexual minorities, what happens when you have enough immigrants to force a vote on rights for sexual minorities? Don't tell me that can't happen; ultimately, there's always a threshold beyond which the government loses legitimacy if it refuses to put certain things to a ballot, and by "government" I mean "ruling party or coalition" if you're lucky.

If I were a sexual minority, I'd see border restrictions as being an existential issue.