Wanting everyone to have healthcare is an admirable goal- but when you set that priority above others that, by the natural order of things,
should be above nationalized healthcare, you subvert the natural law and role of government and threaten to collapse the entire system.
The problem is much simpler than natural law, though- we simple
don't have the money! Like Bytor said, if the government could find a way to nationalize health care while cutting costs and get us out of debt, I wouldn't be nearly as opposed (although I still would be- my opposition would have less fuel, though).
What's better (or worse): 45 million Americans who have health care (which, judging by prescient nationalized health care systems, would be abominable), or
306,728,428 (as of June 21, 2009) Americans with a bankrupt government? (Not so) ironically, if the government goes bankrupt then all that free healthcare goes south- and the poor who are currently protected by various entitlement programs currently established will be worse off than before.