There’s a relevant and oft’ cited Churchill quote to the effect that while democracy isn’t great, it’s better than any other governing system we know of.
In other words, leave us not let the perfect be the enemy of the good.
As for why democracy is the best system, it’s simple; in theory democracy gives everyone a stake in governance. While it rarely if ever works out that way, Churchill was correct that it’s better than any other system we know of.
I think my old man had much the same, or at least somewhat similar thoughts, when he came home from Vietnam. He was a UH1 door-gunner/crew-chief with the 4th ID in the Central Highlands, survived being shot down, was awarded a Distinguished Service Cross, a purple heart, a fistful of air medals and came home with a giant chip on his shoulder.