If you think single-payer health insurance "necessarily would require" abolishing private insurance, then you simply have no idea what you're talking about. E.

If you think single-payer health insurance "necessarily would require" abolishing private insurance, then you simply have no idea what you're talking about. E.g., Canada, the UK, and France are three examples of single-payer systems where private health insurance still exists. So certainly single-payer does not "necessarily require" no private insurance. I would be very surprised if you could find any sigle-payer system that does not also have a private health insurance market. If you understand what single-payer health insurance is, then it actually veers close to irrationality to believe that having it would abolish private health insurance.