The civilian casualties are terrible, but at this point if they don't like Mr dictator, they can leave. A lot of these people are going to be displaced by a full blown war anyways.
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I agree with the first part, the "moral stand" part, not so much. Countries go through internal fighting all the time, especially dictatorships. In the past 30 years, there's countless dictatorship-rebels/government-guerrilla cycles. Argentina, Chile, Colombia, Venezuela, former Yugoslavia, Spain, Ireland, Russia, Iraq, Egypt, now Syria (just off the top of my head). Some eventually settle down, some flare up again. America is exceptional in this aspect. You probably have to go back to the American Civil War.