We just had a local whack job do just that. Family history of homicidal mental issues, brother is locked up in state mental hospital for murder. Guy had been planning his suicide and was at family home, grabbed his pistol, walked at the door and blew his head off.
He could have easily done something something like this.
there was a dude in Tx or somewhere that killed his ex wife and 5 or 6 other people watching a football game...
people really are crazy...