I thought rape and kidnapping were criminal offences

The last time I checked, kidnapping and rape were designated as criminal acts. You'd go to prision for kidnap or rape. Not a psychiatric institution.

But Josef Fritzl, who pleaded guilty to kidnap and rape is going to a psychiatric institution. Why not prison? I spose there will be the psychiatric mumbo jumbo about his mental state, that he is mentally unstable, and all that stuff. But he's a criminal and should be in prison.

Or is it that the psychiatric institution can make a few bucks out of him?