I'm not sure what the outrage is about. The 'study' was surveying how humanitarian law is dealt with in video games. The only conclusion that I derived from that article is that the people who did the study would like more games to address what the real-life limitations are to conflict.
Now, that might be difficult or stupid for 24: The Game, or Army of Two, but I feel like I would appreciate it in a higher class, or more narrative-based game like the Modern Warfare franchise. If perhaps humanitarian law became a plot point, then it could really drive home the actual 'rules' of war. It might even promote a greater understanding of those laws, and lead to greater outrage when things like humanitarian law are violated in real life.