I don't think that anybody should be able to open a business if they can't pay a living wage without a government subsidy.
You are making some gross over-simplifications regarding government expenditure.
Moreover, you seem to think that paying for a national healthcare system is different from paying for other public-services. They are all government expenditures intended for the good of the nation as a whole.
Why do YOU chose to single out national healthcare as a "questionable public subvention"? And how do you make a connection between what a government provides as social-support and somebody opening a business? There is no direct relationship between the two, because they serve different "market needs".
As I tried to explain, in a social-democracy, priorities are made for the general welfare of the community. No distinction is made as to what is the relative importance of one or another. They all have their justified reasons to be
public services.
And, in a country that has serious health-problems due to obesity, you seem to think that private-enterprise is sufficient to provide the nation with costly health-care services? Do you not understand that the Total Health-care Costs per capita in the US are double that of elsewhere in developed countries who have identical health-care services, primarily because they remain private enterprises? (See
here.)
The US having double the per capita Healthcare-cost as those countries with National HealthCare Systems, and roughly the same standard-of-living and market-economies is aberrant. Why should that be if the ways-and-means of delivering HC-services was not seriously distorted because of the much higher-cost of privatized-medicine due to a manifest lack of competition?
(Could we not be doing "other things" with that extra-cost? Like postsecondary education that is very low cost for all comers thus guaranteeing them a good job at a good salary?)
Do you not understand why some public-services - like law enforcement, fire-fighting, defense, paramedics, libraries, public transportation, waste management, highways, food and drug protection, etc., etc. - are run as either city, state or national entities? (Even if the work is often subcontracted to private enterprises.)
And, so, why not a National Public Health-care System ... ?