quote=Gareth Monkton;4291727]But if that person is psychotic, hallucinogenic even suicidal, surely it is more difficult to overcome the impulse ?[/quote]

Yes I believe it does !

A friend of a friend who seems a totally nice person when psychotic and believing that aliens had landed on the planet started to try to recruit others
to join his army to stop the alien invasion. He also went into the local bank
and held them up demanding they hand over the money, he then went into the pub next door and bought everyone a drink. when the police turned up
he was arrested but was never charged because of his Bipolar condition.

This condition causes people to do some very strange things.

fingers1