What bad choice did a 5 year old with leukemia make? Do you want to live in a country where parents have to simply accept the death of their child because they can't afford a treatment? What about when your friend, lover, spouse can't afford treatment for a curable condition that they weren't responsible for causing?
You may be happy with that situation, but I'm not. I'm happy to contribute and benefit from a government funded healthcare system and I accept the trade off that that this means that sometimes we're collectively going to pay for people who have made bad choices in their lives.