Politicians do talk about fighting all the time. But, when they do it’s always general. They key difference is when it is specific: a specific time, a specific place, a specific reason, a specific course of action, etc.
I don’t think the Dem’s should have impeached on incitement as you’d never get the Republicans on board as they would be looking for that smoking gun where Trump explicitly said “go March and raid the Capitol and hang Pelosi and Pence”. What they should have Impeached was on a dereliction of duty and failure to uphold the oath of office to protect the nation. Specifically, when the Capitol was under attack, and Pence was being evacuated, Politicions were calling on Trump to act, speak up and tell them to stand down and call the National Guard but he didn’t act in a timely manner. Forget the argument that he incited it. Focus on the argument that he froze and was weak when it happened. The Commander in Chief cannot be weak in the face of an attack. There would be witnesses and phone records of people calling Trump for help to this. Put Republicans under oath about this and they couldn’t lie. Call on the Commander of the National guard on who ordered him into DC and who he talked to. Call on Trump’s staff that was begging him to act. Call on the Secret Service to confirm that they procedures meant there was no way Trump didn’t know of the attack or Pence was being evacuated.
Don’t go after Trump for attacking Democracy but for being impotent and weak to defend it when it was attacked. He should never be allowed to hold office again because he is weak and America’s enemies have seen this and will exploit this if he ever holds office again.