You are quite coherent and this is IMHO the only case where healthcare could be considered an investment - so that it doesn't prevent people from starting a business.
Not sure it is enough by itself to support a universal healthcare ideal, but this a very valid reason - along with easy to treat diseases when they are caught early on.
Right, preventative care, and not just starting businesses -- it stops people from doing all kinds of good things.
Creating art or writing novels, going back to school, moving across the country, working for startups (not just starting them), having kids (or adopting, or taking a leave of absence to help raise kids)... there are lots more things that could go on that list.
Not all of those things equal "more money to the government". Some are "quality of life" sort of things; some add cultural value; etc.. But having a safety net for health issues fixes a lot of problems even for people who won't ever really need it (but can't know that for sure...), and is a sort of economic equalizing factor that I like more than taking more money from rich people and giving it to poor people.
Not sure it is enough by itself to support a universal healthcare ideal, but this a very valid reason - along with easy to treat diseases when they are caught early on.