The guy was a veteran was in the Marine Corp!!!! Im thinking PTSD or he could have been radicalized who knows!!!
I read on Twitter that his neighbor said he had PTSD and should not have had a gun.
Ptsd does not make people go on a murderous rampage. PTSD is an anxiety disorder in response to trauma.
His mental - medical condition has more to it than ptsd, perhaps he was bi- polar or something in addition perhaps.