I largely agree. I would say in Libya that the nation, apart from Khaddafi's control, the nation's makeup and history tell us that there was little unity amongst the factions and tribes, and that once Khaddafi was out of the picture, chaos would ensue.
In today's world, where really, very large swathes of the world either don't care about humanitarian disasters/civilians being killed, etc. or don't have the means to do anything about it (too poor, ineffectual government, etc.), there just isn't a lot of oomph around the world to deal with violations of international law, be they violating Ukraine's territorial sovereignty, beheading religious minorities, etc. The U.N. may wail about things, but their member states, by their actions, as a whole, don't care a whole lot. Which puts folks who do care in a pickle. Bottom line is that this kind of stuff is going to continue happening, and the U.S. will have limited abilities to alter the course of such events. Even the most agressive, send in the troops, scenarios have been shown to not alter the fundamental realities on the ground and once we leave, which we will sooner or later, things largely revert to the same local strife taking place.