Doesn't this only allow 'patients' who correctly think they have superpowers to escape? How is this a net improvement in holding only patients who are actually insane?
Think of PCP-driven berserkers flipping cars with their mere, ordinary human strength, fully unleashed without regard to injury or death, and you've got some notion of the problem posed by a delusional man who thinks he's Samson.
Rationality quotes time!
The usual rules: