King is literally a founding convoy organizer who calls the shots and has a massive following and influence on the convoy members. His videos get 100's of thousands of views and he influenced the convoy 'manifesto' that they created to try to overthrow the government. Your comment shows you have done zero research into the matter. He's a vocal white supremacist who believes Islam has taken over the government to kill white bloodlines. You can find many videos of him saying this to be broadcast to his following.
I don't doubt he's crazy, I do doubt his crazier views represent those of protesters more broadly. But in whichever case, the administration could take the wind out of his sails by yielding--no need to organize under King if the goal is accomplished. If the government didn't take an authoritarian stance in the first place, King would be marginal.