Insanity is usually accepted as describing a state of being - an insane person cannot be judged by normal Human values, their reasoning is beyond understanding, their behaviour puts them outside that which is acceptable to anyone able to comprehend their actions.

I would accept that there are illnesses such as mania, phobia and paranoia - terms a doctor might use to be specific in an attempt to describe them more accurately for medical rather than legal reasons, which could be more or less severe in their effect.

The actions of the man combined with what he said to explain them would seem to indicate insanity.