War happens when people are so ignorant that they don't know how to dialog and manage and negotiate. The Pope could set a good example on how to dialog by dialoging with the women priests. He could exemplify peacefulness by lifting their excommunications, even if he still disapproves of women being priests

He says, "Humanity 'seems to have not learned that lesson or doesn't want to learn it.'" Did you notice he said 'humanity,' not 'man.' Well all those buried in that military cemetery are human, but they are MEN, that is, MALE. Mostly the very young and powerless. No women soldiers. Maybe if our society was less patriarchal and less chauvinistic, there would be no such war or cemetery, because there would be no men-only hierarchical institutions, and no sicko cultural beliefs or patterns of behavior that lead to glorification of war (and/or no out of control testosterone fueled all-male militias??) Instead of wringing hands why not change whatever causes wars