"Time to move on" is used only when someone in power is guilty. Happened with Nixon. Mitch McConnell basically said the same thing about Trump after J6 insurrection. And I think Garland believed the same thing when he did not move fast enough to investigate Trump. People believe in law and order when rich and powerful face the same consequences as the common man for their crimes committed and not when they are let off the hook.
The US has many such instances unfortunately.
I do think Garland made a massive mistake. Nixon resigned; Trump did not. Nixon largely disappeared, as most former Presidents do during their successor's term. Trump was still communicating crimes and clearly intended more.
I'm drawing a kind of fine and possibly meaningless distinction here. I think Ford made the best decision he could at the time. Garland had the benefit of hindsight: he saw the way the corruption had become far deeper than the President himself. Garland should have known better.