If being reasonable and offering incentives hasn't worked, then time to start mandating vaccination, or face restrictions on what individuals can do in society. I'm glad to see more and more jurisdictions and private companies are moving in this direction.
We only have so much control what happens beyond our borders, beyond being active and engaged members of certain world organizations. But we can very much control what happens within the country, and right now, we haven't done nearly enough to reduce our own vulnerability.