Most invasions are supported because the populace believes the nation being invaded is a threat to them and their own citizens. Iraq, for instance. But then after they've been occupied for 20 years you start wondering why the situation isn't improving like it did in West Germany and Japan after WWII. Then you start wondering if those in government are keeping the situation from improving on purpose so their stocks in the weapons industry keep going up. Life for citizens in the occupied country might be on average better than under the dictatorship, but ya know what, if they like being ruled by a jackboot, let 'em, not our problem. If they want to be free, they're gonna have to figure something out I guess. The whole situation feels like in Iron Man when the big guy was cooperating with the terrorists using Stark's own equipment. Else why wouldn't they have made their own stable(ish) government by now? Someone's stirring the pot, either internally, externally, or both. Methinks both. Unless they really just like brutal regimes?
I mean. To be frank you could probably "help" them out of dictatorships but you'd have to be very oppressive, like a Roman Empire. Don't expect any thanks, and you'll have to brutally put down any opposition until you're done, and even then who's to say they won't fall back into the cycle?
It'd be nice to set up mini westernized territories that more sensible people could flee to and build their own successful countries from. Problem is who do you take that territory from? Subterranean? Haha. Underwater cities? Artificial islands?
EDIT: I forgot to mention, the stupid dictator in charge was originally propped up by us... did the worst of the Nazis and Soviets all infiltrate the CIA or what? Who is teaching these guys, they ****ing SUCK.