The purpose of the criminal justice system is not be a cudgel with which to eliminate political opponents. The infamous "34 felonies" were from a state trial in New York; the state of New York does not get to arbitrarily deny the rest of the country their choice in president. Evidently the rest of the country does not consider these to be serious enough to disqualify him from holding office.
Do you not find it _insane_ that he was awaiting a federal trial to determine whether he was guilty of interference in the previous election, was allowed to run, won, and will now make that trial just disappear?
I agree that it could be abused by an authoritarian to silence political rivals. But there are plenty of laws that can and already are abused, including to prevent justice from being served. For example, the several people close to Trump that were pardoned by him right before he left his 1st term.