Think of Afghanistan as an example, where the US really did create a modern tolerant state ... for a while. Locals didn't want to keep it going, or at least, not enough. Because the idea that there aren't very wealthy Afghans is just wrong. There's entire neighborhoods in Kabul full of luxury villas with people going into fancy restaurants constantly. That's effectively what the Taliban are fighting for.
Afghanistan might have worked out if the US took a king like role sitting in a fort somewhere and saying ok, you're prime minister to some Afgan after each election. The king role may seem like nothing but if a UK prime minister says sod this I'm ruler for life then the king doesn't endorse them and the king is the head of the armed forces which makes it difficult to do such stuff.