They really didn't. It was a dog and pony show under the belief that he would not make his way back into power. The dems/reps did not want to set a precedent of holding a president to account for doing terribly illegal things. They didn't intend to actually do anything to prevent this.
I'm not sure I entirely agree with that. I wonder if the Democrats didn't delay prosecution until late 2023/early 2024 in order to have it be a headwind against Trump running again.
If so, they have been well-paid for that bit of "strategy". Trump was able to delay the cases long enough that the election came first, and now he has immunity at least while in office.
> I wonder if the Democrats didn't delay prosecution until late 2023/early 2024 in order to have it be a headwind against Trump running again.
I think they didn't realize the moment the country was in. They put a judge in charge of the justice department when we needed a bull-dog prosecutor. It was a bad choice.