We’ve been having civil wars since there were rulers.
What was the root cause of all that happened during the Great Schism, the 30yrs war, the French wars of religion or the Protestant Reformation?
All is vanity. Vanity leads to envy which leads to theft, destruction, murder, war, and voting Democrat. Envy is the driver of human evolution. Without it we would still be happily eating grubs from a stick.