That anyone who is diagnosed as psychotic is a dangerous 'nutter' who is out to kill everyone and they should all be locked away in a psychiatric hospital.
Psychosis means you experience things that others do not (such as hearing voices, smelling strange odours or seeing unusual people) and can be very upsetting. However, with therapy and medications most of us live happy, productive lives and do not need to spend time in secure hospital settings. If we ever do need to be hospitalised, it is often because we are exhibiting behaviour that is likely to harm ourselves, not others.