If you didn't notice or hear, Moscow Mitch laid out the Constitution pretty well. While I don't think much of him, he was right this time. Rump could not be impeached because in order to get to the other points, he would have to be able to be removed from office. He is a private citizen. That means that he can't be removed from office, ergo, he can't be impeached and the Senate has no juristiction.
But if you think resigning or being voted out of office protects you from the civilian courts, check out Agnew.
Vice President Agnew resigns
The charges were during the time he was VP where he was selling political favors on the side.
The courts disagree with you. Agnew was like a mini Rump Jr.
No, a President is immune from any judicial process which is why we have an impeachment process instead. Bill Clinton could not be imprisoned either while he was in officer or afterwards for committing the act of perjury.
In any case, there is zero proof that Trump had anything to do with the riot, and much proof that he didn't. The FBI, the pipe bombs, what the mob came there with is all evidence the riot was not spontaneous, it was planned ahead of time.
Now, the Nazis can impeach Trump on it even with no evidence, but a court of law couldn't do anything because a crime needs to proven beyond a reasonable doubt.
When an elected official resigns that ends the impeachment process and the judicial procedure begins. You can't remove a private citizen from a Federal Elected Office. According to you, all an elected official has to do to stop the charges is to resign their office. Didn't work so well for Agnew.
And the proof was presented where even some of the Rumpsters took that walk of shame but couldn't vote to remove him from office. Why? Because as guilty as he is, he was no longer IN office.
I made that same walk over 3 years ago. Many have done the same. The GOP rate of support for Rump has gone down from 95% to 85% and it's dropping fast. And those are the ones that stayed registered as Republicans. The ones that changed their affiliation to something else is not counted.
And, yes, it was planned ahead of time "Openly" so don't try and tell me that Rump was not advised to any of this ahead of time. No one is buying Rump innocense.
And if you haven't noticed, the Scholars have found that the proof presented meets the "Reasonable" and there is no "Reasonable Doubt" that can counter that when the actions of the accused counters any "Reasonable Doubt".
We prevented a Fascist takeover of the United States of America. Funny, you bring up Nazis when I can show you the exact same thing in Germany in 1933 but that was successful. And if I go back to 1926, I'll see it happen the first time by the Author that both Rump and Adolf subscribed to. We were two steps away from the 14 steps of becoming a Fascist (Nazi) Country but there were two doctrines of law that finally stopped it; the Constitution of the United States and the Uniform Code of Military Justice. You can call yourself a Patriot but that's a pretty hollow word to you.