You’re confused. Video has nothing to do with that. Hitler or the mullahs in your country came before the internet. Furthermore, politics is the art of lying. And for practical reasons it will never change; how can you predict the outcome of decisions that are emotional in nature? How can you predict an outcome based on figures that can’t be measured, like GDP or inflation?
Video or text has nothing to do with that but video spreads the word, no pun intended and the internet let me choose the lie I want to hear. Usually the lie that is the opposite of the government lie.