At some point we have to try to make things better, and believe that better (even just a smidge at a time, and possibly with great effort) is possible. Or else we might as well just build the suicide booths from Futurama.
It feels deeply cynical and jaded to me to say, well, just let Iran fund armies and encourage ethnic cleansing, as long as they don't do this one specific thing that is more important to Americans. As long as the horrors you create only affect people in the middle east, we can look the other way.