From my understanding, if you are tried and acquitted, it is unfair to hold the indictment against you.
Impeachment isn’t quite the same as a criminal inditement. Trump did lose election in 2020, but the first impeachment seemed to help him a bit in the polls. And he’s still polling reasonably well.
The Justice Department shouldn’t make inditement decisions based on stopping someone, however bad, from getting elected. But if that was their aim, the priority would be to stop giving Donald wins. And it seems to me that a hung jury would be a win. Only conviction is a loss.