I don't think it counts as a disease if the majority of people, including most successful people "suffer" from it without any negative consequences for themselves. For example religion.
A mental illness does not have to result in major negative side effects to be considered an illness. People can live very normal looking lives, while also having delusional thoughts.
Or maybe this obsession with calling absolutely everything that doesn't fit the everyday-narrower definition of a "normal person" a mental illness needs to stop.
Next thing you know, "People who don't want to be snooped on by the government have a mental illness and don't understand why it's a good thing."
