But noone external to the contents of their head can know that. It's unknowable to all the rest of us. (The only thing the rest of us can tell is they might be confused, incoherent, have a weak, inconsistent or just idiosyncratic set of principles, etc.)
See the author interview of Robert Greene on "Exploring Human Nature" https://www.youtube.com/watch?v=c1tGC401j78