Mosby is the Prosecutor, not the Judge. You want to have prosecutors that want to win. The Judge must be impartial.
I understand that, but even prosecutors are expected to be professional. Mosby yelling "no justice no peace" (which advocates rioting in absence of rioters getting their way) at a rally is hardly professional. That suggests that she based the charges not so much on strength of evidence but on her personal beliefs and politics.
In other news, City of Baltimore agreed to pay Freddie Grey's family 6.5 million dollars. If I was a citizen of Baltimore I'd be pissed at such profligacy with my money. This is nothing but "ghetto lottery" - get your family member to get killed by police and you have a chance at riches. What is such a huge payout based on legally? Future earnings? Did Freddie Grey even have a (legal) job, because I do not think "wrongful death" payouts should be based on income from drug dealing?