Libya 2011 was a civil war/revolution, the "boots on the ground" were locals, western nations weren't willing to risk their own soldiers in an actual intervention and it's highly debatable whether the civilian abuse was ever a reason for the western support (aerial and otherwise), IMHO it was essentially about oil.

Syria is again a good counterexample - Assad's totalitarian suppression of human rights and torture of opposition was notorious and one of the triggers for the uprising in 2011, but noone considered an intervention before 2011 or at that time for these reasons - Assad's regime is a clear demonstration that no, the world is not going to intervene just because your police is e.g. literally pulling fingernails off highschoolers who have been reported as criticizing the regime. The west was ready to intervene only a few years later in 2014, when the civil war had already raged for years and again it seems to have been done for entirely different reasons e.g. Islamic State, geopolitical tug-of-war with Russia and, again, oil - those things matter for likelihood of intervention, unlike just abusing your civilians.

Afghanistan and Vietnam are obviously irrelevant, IMHO noone is seriously asserting that preventing regime atrocities against their own people was the main driver for these wars, other reasons were clearly dominant there.

So in my view all those are just examples that the world is not going to do anything serious just because a dictator is murdering or torturing internal opposition. They may invade for various other reasons, and they may opportunistically support one side or the other once some conflict or revolt is already happening (war doesn't seem as horrible if it's all done by someone else's people fighting and suffering), but as long as the totalitarian state is in control, nobody is going to come and bust the oppressed out of their prisons just to help them.