@Jan:
Thing is Americans who have good insurance cover can still be refused treatment,
Not true. Unlike the EU/UK, hospitals cannot refuse to provide treatment due to lack of payment. I work in the upper echelons of a major healthcare system, unpaid treatment is a major headache.
can still go bankrupt
Anyone can go bankrupt, that’s a good thing as protections from creditors to garnish wages enter in when you are bankrupted. You do have to be pretty irresponsible to go bankrupt though over anything.
and can still die for example from lack of insulin.
Another partial myth. Most people die due to unreasonably rationing their insulin because of myths that are perpetuated about insulin. Almost all cases of insulin deaths are avoidable and parents have gone to jail for ultimately being stupid or abusive about it.
You, with few exceptions, can get very cheap insulin. Go to any vet and insulin is $25/bottle which would provide a human with 30 days of doses. This is the same insulin that was widely used until the early 2000s and still widely used in second and third world countries. If you need auto-injectors there are various open projects for 3D printing those, FDA regulation however prevents the general public from knowing about them. Importing animal derived insulin abroad is an option.
The primary problem right now is lack of human derived insulin, something that was marketed towards diabetics as somehow superior (in all but the rarest cases that is untrue) and Joe Biden recently made it so that insulin has a capped price (similar to EU style regulation), causing all but the largest manufacturers to exit the market both in the US and in the EU - the US market had been subsidizing EU consumption of the product, but the price caps are unreasonably low making even production infeasible which is causing a worldwide shortage and soon human insulin will likely become completely unavailable.
For about 90% of diabetics however (the people with adult onset type 2) proper diet and exercise would suffice.