Unfortunately, they're confusing the words "Morality" for "Legality." I will never question that income taxes are legal, because they are. You'll never get me to say that taxes are moral. Or even all laws for that matter.
They legalized theft, but that doesn't mean it's a moral action.
But this guy has the right idea. He will make the government take action by force, or do nothing. If the government wants to steal his money, it will have to do it by the tip of a gun. And it will show itself for what it truly is.