Highly engaged voters are invested and take the time to understand policy and nuance. Generally this is not the case. All the others are just trying to get through the day. So you cannot win them over with policy and nuances.
You need to show big, bold initiative and follow through.
The Democratic party could not even prosecute a guy who tried to murder Congress. So the thinking goes - Why the fuck would someone vote for them when they do fuck all?
Hell if someone tried to murder you and you just gave up and went about your way, no one would trust you to do anything of substance. That is the problem with the Democratic party today.
What I am trying to say is, it doesn't matter whose job it was. People vote for a leader. It was up to the leaders to make it happen. That happened to be the president. It's nothing more complex than that.