We passed laws to allow the government to provide certain services to people that, by choosing to use the service, have agreed to the process. Now, we can debate whether certain programs should have been provided by the federal government, but the people using the program are doing it voluntarily.
Now, if the government tries to mandate that everyone must buy insurance, that seems like a big step to take. If necessary, I would be willing to legally fight for a person's right to not purchase insurance if they made the decision to not buy it, or, for my right to choose the plan that I want. Presently, I am on a high-deductible plan (one that probably would be considered under-insured by the new law).