As I said earlier, some of these are committed because of differing beliefs (think religion), even amongst the same family you have differing beliefs. Some are done because of differing brain chemistry (physical), some are done because of ailments to the brain (think brain tumor), some are done because of brain injury (think major head trauma), and some are done simply because one believes it is what God wants for that particular individual to do (may or may not be mental illness). In my prior response I simply was abstract rather than specific, but these are exact reasons and none of them "have" to be a mental illness or mental disorder. Some "may" be a mental illness or mental disorder but can also be strictly physical or spiritual.