I am going to put myself in the shoes of the Trump supporters I know personally, because I doubt you will get an honest answer from anyone here.
To them, they not only believe, but "know" there is a conspiracy of powerful people pulling the strings behind the federal government, such as the "smoking man" on the show X files. With that in mind, they "know" those powers put Biden and most others in office, have rigged the election in such a way as to leave no hard evidence, and are actively working against Trump, who to them is somewhat of a "savior".
Their views are all rooted in their personal failures to get ahead or further ahead. They may have lost a family business because of competition from china. Lost their blue collar factory job to overseas manufacturing. Perhaps their "pride and joy" came home with another guy or wearing a dress. All this they pin on some kind of organized global agenda.
Because they "know" this is all true, they feel their vote and their voice has been silenced, and they may feel their only path to ensure future prosperity (or the return of things to the way they were) is though violence. This really is no different than other countries that have had violent overthrows (including nazi germany). Remember, to them it is the other side acting unlawfully, so such action is justified as a form of "Self defense".
I would be willing to bet that the majority of Trump's base feel that violence may be needed, or if it happens they would not be against it. I do doubt that there is enough organization or wherewithal from these folks to actually see much happen, but should something happen I think there are plenty that would try to join in.
When this happens in other countries, there usually is some kind of charismatic and intelligent opposition leader. Trump is a dumbass who basically keeps a loaded gun pointed at his feet.
