One interesting thing I noticed about this thread: both the people who are arguing the strongest in favour of a privatised system are successful entrepreneurs. As such, they fall into an all too common logical fallacy for which I don't have an adequate name, but would describe as "argument from expertise."
What I mean is people who are experts at something are often surprised when it turns out not everyone is an expert at that same thing, and tend to chastise those people for their failures. Computer systems administrators (that's me) are surprised when people don't run anti-virus software and don't back up their systems. Financial experts are disappointed when not everyone puts a portion of their income into savings. I'm sure even Rolfe at times is surprised and disappointed by people who don't seem to know how to look after their pets or livestock.
And many entrepreneurs seem surprised by people who don't want to spend 16 hours a day, six or seven days a week, for years, often at great risk to their financial position, building up a business. It seems the skills required to build a business are similar to the ones needed to build up a financial reserve and negotiate the minefield of private medical insurance: persistence, financial prudence, and a willingness to negotiate. And, perhaps, a willingness to spend hours and hours hunting for the best options and plans.
I have news for the entrepreneurs: not everyone is like that. And to expect everyone to be like that is as silly as me expecting everyone to have a backup and a disaster recovery plan in place for every computer they own.