according to Szasz, the science of mental sickness is all metaphor and the emperor has no clothes. Some people ought to be suffering, given their lives. Others convince themselves that they ought to be suffering, but that doesn’t mean they have a disease, any more than those who convince themselves they ought to be happy have a disease. Yes, some people have strange beliefs. But think of it this way. If you believe that aliens are watching over you and that they will punishyou if you do the wrong thing, we call you delusional. But if you believe it is a large man with a beard watching over you who will punish you if you sin, we call you normal.

https://www.psychologytoday.com/blog/theory-knowledge/201212/is-psychiatry-the-science-lies