The paper first demonstrates the ability to provode objective data and analyses during war and then examines the need for such objective gathering of data and analysis in the context of mass violence and war, specifically in the 2009 Gaza War. That data and analysis is required to assess compliance with just war norms in assessing the conduct of the war, a framework quite distinct from human rights norms that can misapply and deform the application of norms such as proportionality and obligations not to target civilians.