Either we pay for everyone's coverage in increased fees via the capitalist system...
... or, we pay for everyone's coverage in taxes via socialist systems.
Yes the government is inefficient, often corrupt on the micro and macro levels, and all that. But they, theoretically, still have my best interest at heart.
Compare that to the capitalist system, in which, start to finish, companies only have their bottom lines as primary motivators and consumers are nothing more but inputs.
Sure, sure, *on paper* capitalism has competition and all the other theoretical balancing factors. But in reality, we see collusion and we see maximizing the short term rewards to shareholders over long term growth/health of the company *OR* the people it services.