So, it's a battle between Dane and Sane? I would submit that Dane is not insane, but rather that he has an alternative reality paradigm that is unknown to the rest of us. I enjoy the rare glimpses at the Inner Dane among the straw men and post-hoc fallacies. There is some form of intelligence there; I just can't seem to get a lock on it.
I know the problem. The only term I've been able to come up with that seems close to the mark is "malsentient", and that's not even in the dictionary.