Have other folks actually stepped inside a VA facility? Many of them are old/outdated/underfunded it's true. But some of them truly do offer superior care to a typical private hospital (in staff, facilities, and outcomes). The VA system could use significant improvement, absolutely. But if the fear-mongering 'worst case scenario' is that everyone gets VA levels of healthcare, that's still a huge win for all of America. That's a great baseline standard to start with, that no one should ever fear falling below.
If an uninsured American is critically injured, the options today are "A: Die" or "B: Bankruptcy". Having a new option "C: Universal VA-levels of healthcare" would be a win for literally every American, even for Americans who are lucky enough to already have great private insurance and who would never need/use this option themselves.