Is Michele Bachmann a nut?
Yes, because when people believe things which are grotesquely factually inaccurate and just generally this extremist and fringey, when they speak and behave in ways which express a fearful and hate-driven world view disconnected from factual reality, they are just nuts, they are just crazy ideologues.
That they are sincerely nuts doesn't alter that they are nuts, it only intensifies it. That they proceed from sincere hate does not mediate, mitigate, or ameliorate that they are hateful, it only intensifies it.