All types of social welfare spending have increased over the last 50 years, not just healthcare. A larger proportion of the population is dependent on the government now than 50 years ago.
Of course one thing not brought about social welfare is that isn't a choice of to pay or not but to pay now vs pay later no matter what you do - in addition to humanitarian and reputation impacts.
It is harder to calculate given hard numbers only exist if things go wrong.
Not paying for vaccination or hygenic programs leads to outbreaks which are expensive to contain and not containing leads to even more.
Even literally leaving people to die in the street still generates expenses
The evidence shows that social welfare spending can increase future costs. For example it increases the percentage of women who have children out of wedlock. The increase in social welfare spending is the primary reason why the percentage of children born to single parents rose from about 4% in 1948 to 40% today. That in turn increases nearly every type of socioeconomic problem.
Maybe people just don't put as much importance on weddings as they did when children out of wedlock had substantially reduced rights? I don't think the link to increased welfare spending is as clear as you make it. I for example only married for the tax benefits.
The evidence suggests that increases in the availability of social assistance cause an increase in the percentage of children born out of wedlock, so it's not merely an observation of a correlation.
There are undoubtedly other factors as well, but the expansion of social spending is one of the major ones.