The word of the day is "BROCCOLI"
If government can force people to buy medical insurance, why not force them to buy broccoli?
Because not buying health insurance does not eliminate the use of medical care, it just shifts the costs from the individual to others. This is not theoretical, currently every health insurance policy holder is paying about $1000 dollars a year extra in order to cover costs incurred by the uninsured.
When you choose not to buy broccoli, you are not shifting its cost onto someone else.