Because in today's world with the contemorary views on the role of government, a nationalized healthcare would include massive tax hikes. And to me, the removal of choice (so long as it does not harm anyone) and taking more money out of my pocket equals a decrease in personal freedom.
9sublime, this comes down to the fundamental, core disagreement between conservatives and liberals. Conservatives, traditionally, believe in individual liberty, self-responsiblity, and voluntary charity in the Jeffersonian model whereas liberals tend to buy into the Marxist "for the greater good" philosophy where the government takes care of you from cradle to grave. Personally, I just don't have that much faith in government bureaucracy that I am anxious to put them in charge of my health. I believe government is the problem. You think it is the solution.
I am obviously not a true liberal then. I value personal freedoms and self responsiblity, but at the same time want people to be given their human rights. I want a less intrusive and all powerful government, but a country still needs to care for its poorest citizens if its going to arrest them and jail them for crimes etc.
Whats wrong with national healthcare but people also have the option to go private if they want? As I've said, divert the billions used on bombs every year making other people injured and sick, and instead look after your own. Then you wont be any more out of pocket than you were before.
If you want to go private you can, if anything it gives people more choice in life and some people dont even have a choice, they just cant get healthcare.