One thing I'll throw out there before I venture back into the dark- Riley also dealt with some serious anger issues while at Fort Irwin as well, to the point she was medicated. There's been a history of issues... just to add to the pile.
Yup, to quote Puck She did it to herself. He then council's Michael to not stick his neck out for her. Sure, the cruelty to Lizzy pisses Riley off, but she does not pull the trigger until Angel was brought up and Her entire existence is avenging Angel.
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