A little reason in the midst of the usual libertarian nuttiness:
Saying it's not a right doesn't really mean anything. Electricity isn't a right, but it is highly regulated, because in a modern society it's a necessity.
Ditto for water and heat.
Other things are treated by society as a public good: roads, police, and fire protection, all of which were, at one time, private enterprises. Once, for instance, NYC had two competing police forces. In Philadelphia, Ben Franklin ran a private fire company.
Arguing that it should be that way again will get you nowhere, because it simply isn't going to happen.
Healthcare in every other industrialized country is treated as a public good. In the case of Canada, the fact you can get private healthcare is analogous to the fact that if you can afford it, you can use a private limo to commute to work in NYC. Most people use the buses and subways - government-run in every city in the world, to the best of my knowledge - a small minority use taxis, a regulated utility, and a tiny minority get to work in private limos.
Healthcare, in all other rich countries, is treated the same way. From a financial POV, it makes the most sense by a wide margin, because of the economies of scale involved in covering everyone, so cherry-picking healthy folk isn't a problem.
The current USA system, such as it is, is socialism for the covered corporate/government employee, and a free market for small business workers and owners and self-employed people. The result, of course, is that small business folks and self-employed people massively subsidize corporate and government employees. The result of that is that most sane people with an economic choice decide to work for large corporations or the government.
This is the least optimal outcome. You want a system where people make a choice to start a business or be an employee based on their inclinations and abilities. What you have is a system where large numbers of the most intelligent and able wind up working for years for other people, and only strike out on their own when they know they won't endanger the lives, quite literally, of themselves or their family by exposing them to the dysfunctional "market" for healthcare the USA has, which is rife with cherry-picking.
The solution to this problem is to treat healthcare as a public good. A mixed socialist/free market "system" - really a mess - is the worst possible choice, but it's the choice the US has fallen into, by historical happenstance.
It's completely indefensible. It delivers the worst care at the highest price.