Because a single payer would, by definition, cover everyone.

Private insurance companies and employers (the two places most Americans get their health insurance from) may not want to pay for the higher costs associated with higher risk people like this. Employers would be especially susceptible to this sort of discrimination if proposed legislation allowing employers to demand genetic tests of their employees passes.

https://www.washingtonpost.com/news/to-your-health/wp/2017/0...

The discrimination referenced in the article is not just about insurance costs. Even if health care costs were totally removed from employees they would still have reason to discriminate on genetic factors.

We are all a part of the human race and we owe it to ourselves and our fellow humans to take care of each other.

Because the nature of the current system has incentives for employers to have a healthy "pool". When you have larger pools with a single payer, that goes away. With the current system, those people will end up either getting care that isn't paid for and gets picked up by taxpayers, probably not enough to survive. Or, those people will be shunted to high risk pools, which will be largely paid by taxpayers.

ELIZA, is that you?

Because a single-payer health system (like the NHS) largely prevents this discrimination.

Do you think I am ELIZA? Would you like me to be ELIZA?

Seriously though, I quoted the reference exactly in my question, since I knew people would be touchy about the subject. Based upon other people's reaction to my question, some people are very touchy about the subject even when addressed elliptically and without pre-formed notions.

Thank you for your answer.