On what, pray tell, are you founding the emboldened statements above? By my reckoning, the answer is nothing other than abductive reasoning, which, while it may be sufficient for you, isn't remotely so for me.
Regardless of what you think, or would like to think, an indictment and/or criminal conviction would achieve, I think you are disregarding that legally there are three ways to remove someone from the Presidency, and only two of them are legal. Of the two that are legal, there's absolutely no assurance that either would be implemented.
While, as the above documents explain, the notion of indicting the person who is also the person ultimately in charge of the organization that's prosecuting him/her, the DoJ, is highly problematic, even more problematic is the prospect of a person holding the Office of the President after being convicted.
- What happens if Congress refuses to impeach and unseat such a POTUS?
- Say the POTUS signs an executive order making the WH a federal penitentiary and orders that he be transferred there. Think of the other heretofore absurd EOs a convicted POTUS might sign that would all but fly in the face of everything pertaining to the principles of jurisprudence, crime and punishment.
- Will the judicial branch step and invalidate any such EO? What about other EOs the POTUS might issue?
That's just one example of the foreseeable mayhem to beset us were we to have a convicted felon being POTUS while also supposedly being incarcerated. With a POTUS like Trump, one for whom everything is personal and for whom everything is about personal allegiances, the U.S. could very quickly descend into an authoritarian "republic" much like Turkey, the PRC, Russia or Renaissance England, for example.