He writes,

the one thing libertarians grasp better than conservatives or liberals is the danger of the category error when it comes to the role of government…The fundamental insight of libertarianism is that the government is the government. It cannot be your mommy, your daddy, your big brother, your nanny, your friend, your buddy, your god, your salvation, your church or your conscience.

Read the whole thing. I think that Category Error would have been a good title from a purely intellectual standpoint. But it would not have landed Goldberg onto the bestseller list.