I think what Convenor Pace was making a normative rather than a positive argument. From what I understand, he argued that it is less expensive to invest in the International Criminal Court than it is to invest in war-making. As such, this is where the focus should be, even though this is not where the focus currently is, as you point out. I agree with you that states view security as a top priority in foreign policy and that states may think that “security measures” (which I assume means use of force) are the most rapid and efficient way to solve geopolitical crises. But I think this is the problem that Convenor Pace was pointing too: promoting peace is not seen to be related to increasing security. However, perhaps if greater priority was given to promoting peace and justice, then this could increase security by preventing or at least mitigating future crises. I do not think anyone doubts how difficult it is to change this thinking, but I do not think that the fact that it will be challenging to convince governments to change their practices diminishes Convenor Pace’s argument that they should.