How would one hold a prosecutor accountable for this error? Voting them out the only way?
Doubt it was an "error," it was likely intentional for a number of reasons.
For one, there is a case out there that holds that firing into a rural treeline is insufficient to support a conviction for Crim Reck. The theory of the state's case was that a hunter might have been out there..... This case is most likely distinguishable, but possibly not.
For two, filing as a misdemeanor does not automatically invoke trial by jury; the defendant has to request a jury trial in a timely fashion. Cases are way easier for the state to try to a judge instead of a bunch of random citizens.
For three, lots of people go pro se, like this guy did, in misdemeanor court. Conversely, the vast majority of of felony defendants seek counsel. Counsel who is likely going to know that there is a case out there that is uncomfortably close to holding that the prosecutor cannot win as a matter of law.
Ultimately it is the prosecutor's call, if it gets him unelected, that is his problem.