They aren’t though unrelated. They are part of a pattern that started months before the speech and continues to today.
Trump lies. You need to look beyond his words at any particular moment, which could be anything at all, to put the totality of the event into it’s context.
He was addressing a mob. A mob he had encouraged to believe the election had been “stolen”. A mob intent on trying to stop Congress confirming the result. He didn’t tell them to go home and let democracy prevail. He described the representatives as good people, presumably because he was encouraging the mob to think they would listen to them. He also told them to fight.
If I was a Barrister I would have no problem justifying the way the speech was edited to present the truth behind it.