It's all a matter of perspective. Clearly, for the people onto whom atrocities would be committed, nothing could be worse than how things would have been, and anything done to preclude those atrocities being committed would be an improvement. Put yourself in their shoes and ask yourself whether you'd prefer having the entire world stand by watching you being attacked. Any reasonable person would clearly hope and expect that people of conscience would not stand by and let such things continue unabated, and they would be justified in their expectations in that regard, simply on humanitarian grounds. We're not talking about people not having access to the latest films or books - we're talking about sanitation, power, emergency care, basic necessities - all being withheld - and the inevitability that the government there would commit much worse (if they haven't done so already). There is a threshold of offense beyond which it would be morally indefensible for the outside world to just sit back and do nothing.