I've received legal instruction from both current and former prosecutors and I've reached a conclusion:
People need to participate in democracy
I don't care if your vote doesn't count for shit in a national election. On a local level, your vote fucking matters. If there's anything I've learned it's that prosecutors will hold themselves to community standards. But that only works if community standards are communicated to them effectively at the ballot box.
I have been told in as many words that we could quadruple the number of marijuana-related arrests in my county in a single day if we wanted to- legally. We don't because that's not what the community really wants. It's not even because it's a Democratic county. There's a neighboring Democratic county that has no trouble throwing the book at people, even more than another Republican county nearby. People need to understand that their justice system is absolutely a reflection of what happens at the polls.
Prosecutor misconduct is a bear of a slightly different color, but only slightly. We really can make a difference in how our justice systems operate by putting in marginally more effort in involving ourselves in the process. Otherwise only the local lawyers are really involved, and you don't really want that, believe me.