govt has not controlled health care costs over the last 40 years, so why would we expect it now?

The govt share of health care spending has risen from 25% to 50% in the last 40 years-- a time period in which health care costs have increased dramatically.

Of course, there are good reasons to believe that this is cause-and-effect. More government involvement can easily increase costs.

In any case, mere correlation should give us pause. Govt has been unable to regulate costs as they have become more and more involved.

Or if they suddenly get successful in regulating costs, what will that look like? A lot more rationing...