(As a funny aside, I just thought about how doing so would probably be considered Ti. But I don't use that! No!)
And Captain Chick, indeed, you must remember that someone can definitely use Fi to support something you totally disagree with. There's a similar occurence in the Enneagram. You know Ones are staunch about their beliefs, and usually frames things in some kind of ethic/honor system, right? Well, that may be true, but two different Ones can have dramatically opposed systems of belief. So they will both staunchly beat each other up over it.