1. It turned into a "Be afraid of working class men" story. Yes, the set-up was more complex than that, but it boiled down to "Be afraid of valets."
2. Prentiss, on arresting the guy, hopes he'll be raped regularly in prison. Prison rape is a problem, not a solution. Yeah, that's an emotional response, not a reasoned one, but until now, Prentiss has seemed a little more enlightened than that. (And, yes, she would be creeped out by someone who preys on attractive brunettes. But the scene was still played as, "He will be punished in prison by being raped." Frankly, given the character, odds are good he'll be in prison looking for weaker inmates to rape. And given that humans are fallible, some of them will be innocent of the crimes they're convicted for.)