"Agree to disagree" and being patient/loving is about the only approach I found works. Not good at being persuasive, as I'm more of a direct person. Maybe that's my flavor of autism, or I'm just a recovering naivety addict. What happens if we find out these issues were creeping health concerns that went unnoticed long before the COVID shots? What then? Would something like that be part of the 60 in the 60/40? Probably so, as revealing decades of systemically infecting people with cancers, heart problems, and neurological disorders might be a bit much for people to handle. Hell, the religious stuff is a bridge too far for many.
What to do? The slower the change in perspective and outcome, the more permanent. Future generations will have it so much better than all those before them. Stay positive and be supportive. If it were easy, it probably wouldn't be worth it.