I don't know that firing people is necessarily the best way to approach the problem. It might make us feel better but it won't solve the actual problem, which is the overly prosecutorial society we have.
I don't know if it's the best solution either, but the fact that the petition calling for Carmen Ortiz's sacking reached 25k signatures in three days, alone, suggests that distaste for our "overly prosecutorial society" isn't exactly "rare".
Having multiple hops in the chain of command behind Aaron's prosecution publicly called out like that can't hurt, and makes it seem less of a "backlash" and more of a "this isn't right."
Having multiple hops in the chain of command behind Aaron's prosecution publicly called out like that can't hurt, and makes it seem less of a "backlash" and more of a "this isn't right."