I agree that in this situation the laws on the books should also be under review. But prosecutors have some discretion as to whom and what and to what extent they'll pursue a case. Regardless of where they might be on a spectrum from noble, high minded civil servant to the most egregious political opportunist, a consequence to the prosecutorial action this case (public opinion, increased scrutiny, career consequence severe or light, etc.) could help establish an incentive for others in the future to act differently. Not legally binding, not compulsory, but just a element of "Let's not make that mistake again."