Then why have people been allowing the upper classes in almost every developed and developing country to grind down the common people with suffering? How are we allowing the 1930s to happen over again if we've learned our lesson?
Franklin Roosevelt is turning in his damn grave these days. Every attempt he made to moderate the horrors of capitalism so as to avoid the worse horrors of totalitarianism is being rolled back! This must not be allowed!
I must admit i dont have any answer to this. And obviously more of the same doesn't work - i wish you could craft this learning experience into games. Like participating in a civil war- at the beginning you are blindly on a side- but then you play a second story, and lose some beloved character to your own murderous attitude, and you do that again and again, until it becomes clear that the enemy is you giving in to instinct.
But even that could only educate on basic humanity- you cant transport complex mistakes like economical mistakes in such game.
I think most people believe we already know. Suffering --> Revolution --> Dictatorship is a very common pattern. I think there is a lot to learn from the circumstances and based on the histories I've read of e.g. WWII germany, that feels like the general focus. I think its popular to initially focus on the person themselves, though once you begin any serious study of a particular revolution, the circumstances and cultural influences become so pronounced that the idea of the particular dictator being of importance begins to shrink.