> If you didn't pay for it, somebody did.

The tax payers. It's a government service, just like policing or firefighting.

> Why should a stranger be forced to pay for your medical care?

You may want to revisit this question if you ever find yourself in need of medical care. Ultimately, it boils down to which way you prefer to play the game of life - in a cooperative way, or dog-eats-dog, you against the whole world way?