I understand that theres an argument for removing private insurance companies in favor of thr government can cut costs. It can also increase them.

I'd argue that the primary issue with insurance costs today is the lack of market competition, obscurity of what costs and prices are, and government protections that prevent insurance companies from being legally liable for many of the problems they cause.

Corruption and monopolistic practices is a big deal in healthcare, for example. We'd be better off, in my opinion, by solving that rather than killing an entire private industry and hoping our government can continue to do it better indefinitely.