Because of the total obstructionism (which in itself is an impeachable offense) Trump presented by refusing to allow anyone that had been subpoenaed to testify, democrats had few options to drill it into the dull brains of republicans in Congress as to how serious Trump's offenses outlined in the Mueller report actually are.
Having John Dean testify as to what or what isn't an impeachable offense was creating the roadmap that seems to be necessary for republicans to understand the seriousness of the Mueller findings. John Dean has an eidetic memory, which means he's able to recall not only details, but the tiniest minutia precisely, even to the date and time of that detail. Joyce White Vance, former U.S. Attorney; John Malcolm, Senior Legal Fellow at the Heritage Foundation; and Barbara McQuade, former U.S. Attorney were all called as expert witnesses.
I have read the report and I do see the point you are trying to make. But I have a few concerns that these lawyers, investigators, and officials seem to not want to address. I would oppose any sitting president for obstructing or conspiring with a foreign nation to change the outcome of any US election.
So if you want my support to Impeach a sitting president in the current circumstances this is what needs to happen. I am telling you how to gain the support of most Americans in this process, if you chose to dismiss it as opinion, its on you.
1. Mueller, team members, and witnesses must testify.
Mueller lied to the American public when he stated he can't recommend any criminal findings. And now he refuses to testify (which he made clear in his public statement)
Question: Why would the lead investigator refuse to testify about his own findings? This leaves everyone with the suspicion that his report is filled with one sided allegations not supported by other evidence or there is some connection about the origination of the FISA applications and Mueller.
2. After they Special counsel made up of super lawyers and FBI investigators have not dug up enough evidence to make a criminal recommendation, why is it important to read the transcript of a report that has no evidence to support criminal recommendations?
3. The DOJ and the Attorney General have both determined that no conspiracy or obstruction exist.
These are all problems for most to support an Impeachment process. No amount of discussion is going to overcome the current situation. If Mueller refuses or doesn't testify, this is nothing but another witch hunt for a political end.
If Mueller changes his mind, testifies, and provides evidence and witnesses to support criminal charges, most will follow through. I know I will.
Even the suggestion of bringing in John Dean is a comical stunt in most minds. If Democrats continue down this John Dean look alike path, this is going to end up exactly what it looks like. A joke.
Mueller and his team are the ONLY key to success. If the actual authors of the Mueller report won't testify, what does that tell every person watching these hearings. It looks like a cover up and we add fuel to the fire by asking convicted felons to testify on subject matter they were not involved in.