Its very much for lack of trying. They had 4 years, we got no epstein files and they slow walked prosecutions to happen during the election, thinking it would help them. It didn't work, here we are.
Securing indictments and going to trial is an instance of actually trying. So you really can’t say they didn’t try, because that is factually false. It’s true they could have done more, but they didn’t do nothing as others are saying.
One thing about prosecuting a former POTUS for the first time is it has to survive the test of time. You can't behave like them if you want the prosecution to be legitimate, because they are lawless. But it was the failure of voters to do their due diligence to not elect a felon who bear the ultimate blame, as they are the final check. Now we bear the consequences. But again, not for lack of trying.