In this case it seems easy to be against it because a widely unpopular candidate is the one being prosecuted.
However, allowing felons to run for office precludes the ability for the government to silence political dissidents by making up laws/falsifying evidence that they can be imprisoned for.
The risk of a Trump presidency is still on the table, but the US can avoid situations like what happened to Navalny in Russia as well.
In the 1920 election, Eugene Debs campaigned as the socialist nominee for president from prison, having been imprisoned for advocating draft dodging. That is the sort of candidate I would still support, even from behind bars.