I hate our healthcare system and especially the parasites that run health insurance companies, but they do provide a product.

1. They pool our money together so that the ones that need healthcare can afford it. Barely anyone can afford out-of-pocket cancer treatment or a stay in the ICU after a serious accident. It could be a serious pain in ass to get insurance to pay sometimes if they even do, but overall, they do pay. If they never paid, we'd have a revolution by now. The last time they started with not paying, people started demanding change, which almost lead to the public option.
2. They offer a check on healthcare providers that want to over -treat and -prescribe to charge more money, or doctors that go rogue with whacky ideas. Since the general population doesn't know much about medicine, doctors would be able to prescribe all sorts of illegitimate treatments if we didn't have a body making sure that their recommendations were legit.

I agree that they do fucked up things, like withhold on pay outs, deny interventions that may save lives, charge way too much, and lobby to maintain or even improve their wealth and power, but they do still offer a product. I'm someone that is lucky enough to have access to 100% free government healthcare in the US. Even with that, I'm often jealous of people that have private insurance because I find many benefits to their healthcare over mine.

If we want to improve our healthcare, I think it would be best to acknowledge the reality of the situation rather than exaggerate it.