Should prosecutors be more objective in their treatment of defendants who are portrayed as victims in court proceedings?

Should prosecutors be more objective in their treatment of defendants who are portrayed as victims in court proceedings? Many recent high profile cases have focused on the victimization of the accused defendant in a trial (Casey Anthony or George Zimmerman). Your text also detailed several cases where mitigating circumstances were used to influence the outcome of a criminal trial (the N.Y. subway vigilante). Should prosecutors be more objective about this victimization when prosecuting these cases?