Dennis
If Donald Trump opposes mandatory health care , then I am with Donald Trump.  Our health care is an example.  There is no incentive to not use the system and thus we have the debt ridden system. If health care is in the private sector there is an incentive to not use it, rather use it as necessary.

I have seen no evidence that suggests that medical insurance must be mandatory. 

Another similar system is social housing. What an expensive mess. Imagine if that was replaced by money so that the poor would have some selection in where they live, same as people with money, namely live where you like, where you can afford. Cities/communities  would not have to build and maintain housing.

We have thousands of examples of the private sector working well. There are now some examples of private/public working. in health  care. Give it time. The US with private, medicaid and medicare is really a combined system, one of its own.