Well, that's the question.

To date, there has never been a system of socialized anything that has worked in the long term without either taxing people to the point of diminishing returns or cutting benefits to avoid a system collapse.

In the case of Health Care, if the market doesn't decide (ie, through cost) who gets treatment, then at some point the government decides. And that by its nature probably has to lead to questions, even if indirectly, of who lives or who dies.