Possible Clues:

• Shy cop cooked course for disturbed person
• No remorse for antisocial behaviour on road to Bates Motel perhaps
• Profiler's subject
• Who's not normally shy, apt to grab axe?
• The Joker, e.g
• Violent unstable type of old film direction
• Half the bunch of flowers cut into pieces in trail recognised by profiler
• Film course for one with a problem
• Spy criminal taking hack at hotel? Norman Bates, perhaps
• One emotionally unstable, often violent