You're right, it's not just that people opposing it are stupid or brainwashed: Some of them, to your point, are selfish and don't want others to have access to the nice things that they have.

Can you explain why those people DESERVE access to better care? Do they have more complex/rare diseases that require specialized treatment? Are there specialists who only work at that hospital? Those feel like warranted needs. But "I can pay more so I should have better things" is a ruinous worldview that, at its end, is just Might Makes Right.