I'm not suggesting that we go in all screaming and shouting and gung-ho, but although we are not a police force, the UN does have certain policing responsibilities and as part of that organization we may have an obligation to do something.
I have every respect for the charity workers out in the region at the moment. Many of these NGOs get a lot of grief from the military and I would like to support them where they are working responsibly, as most of them do. They, however, have no capability to do anything other than deal with the consequences of autrocities and publicise what is happening. They can't take any action to prevent further autrocities, nor do they have the option of peace enforcement.
Gorilla - I regularly contribute to charities working in difficult situations, however this is not going to solve any crisis.