Does seem to be a loner. Does seem to be a nut.
That does not preclude that he was also very useful to the jihad inside America.
I do consider jihadis and most mooslimes to be insane and demon possessed.
Whether schizophrenic or whatever, sounds more like our usual mass murderer profile: young, male, mentally ill, on prescribed drugs and deep into violent video games.
This is the issue we should be dealing with, though in practicality it results in less loss of life annually than, what, lightning strikes or some other type of freak accident.