Cass Sunstein describes the symptoms that distinguish the insane libertarians.
1. A "wildly exaggerated sense of risks — a belief that if government is engaging in certain action... it will inevitably use its authority so as to jeopardize civil liberties and perhaps democracy itself." I guess the key word there is "inevitably," or I just don't see what's wildly exaggerated about thinking something like, oh, say, NSA surveillance jeopardizes civil liberties.
2. A "presumption of bad faith on the part of government officials." It's the presuming that's nutty, right? I guess we're allowed to be skeptical of the government without looking crazy. Hey! I'm beginning to feel like Cass Sunstein is the government official and he's in bad faith, trying to make us feel that we're crazy if we suspect the government isn't really all about helping us.
3. A "sense of past, present or future victimization." Should I delete my comment at #2? To be safe? Or does the government already know that comment is there, will still see it even after I delete it, and will count the deletion itself as further evidence of my paranoia, when they decide to round up the paranoid libertarians.
4. The "belief that liberty... is the overriding if not the only value, and that it is unreasonable and weak to see relevant considerations on both sides." The sane people balance values on both sides.
5. The "passionate enthusiasm for slippery-slope arguments." The paranoids think if you let the government take "an apparently modest step today," it will do one more thing and then another, and tyranny lies ahead. Only a nut case would think it proper to take alarm at the first experiment on our liberties.