The problem isn't having health insurance. It's having to buy health insurance. It widens the scope of government authority and corporatism at the expense of liberty for individuals and communities. It leaves no room for people to, for example, pool their resources in other ways. Sure, there's an exemption for Amish or other "recognized religious sect" but that leaves a constitutional issue of its own.
Sooo... you think people should NOT buy health insurance?
It doesn't actually matter if you think people should buy health insurance. What matters is that the federal government is forcing people to buy something.