believe that the election was stolen

ofcourse they do, they are part of the Maga Cult " Cult is a term often applied to new religious movements and other social groups which have unusual, and often extreme, religious, spiritual, or philosophical beliefs and rituals. Extreme devotion to a particular person, object, or goal is another characteristic often ascribed to cults."

Many problems and wars have been about ( forms of) religions. Maga isn't any different. Though, I am using the word "religion" here in a broader metaphysical/philosophical meaning. Belief-system maybe.?