People could have lowered their expectations, but in the real world that wasn't how things went. Instead of losing faith in the power of government to work miracles, people believed that government could and should be working miracles, but that the specific people in power at the time were too corrupt and stupid to press the "CAUSE MIRACLE" button which they definitely had and which definitely would have worked. And so the outrage, the protests - kick these losers out of power, and replace them with anybody who had the common decency to press the miracle button!
Later on, people still thought the government should be all-knowing, even after it was exposed as incapable of knowing; the combination of overconfidence, overpromising, and underdelivering made a wicked concoction of discontent