Everywhere it has been tried on a massive scale in a diverse society, there is rationing.

That is the same argument that people who oppose single payer use to squelch dissent. Too many companies have an interest in stopping single payer before it is even given a chance. Sorry, it works or the rest of the world, it will work for the US too. The VA is not so bad from what I have heard. It could be improving with the New Veterans Affairs Chief Dr. David Shulkin. https://www.nytimes.com/2017/05/09/us/politics/new-veterans-affairs-chief-a-hands-on-risk-taking-standout.html