Hua, so many questions. I think this is due to my total recall. Back near the beginning of our discussions we came up with ideas of what our guys would be up to, and why. The reason we came up with was because the organization had become corrupted and our guys disagree with the way things are running now. Part of that discussion was the killing of half breed babies and children(If I'm not recalling incorrectly) and the killing of those simply suspected of conspiring to "Instigate war" a.k.a. disagrees with the organization's policies. The organization was founded and run on very reliable an honorable principals, but like all things that do not grow and progress, it stagnates and rots. Those running it not are not nearly as high minded as those who founded it, and because of that we have a corrupt system. I would say our guys don't want to tear it down per se, but they do realize that the only way to fix the problems with it is to first burn out it rotten core, gut it of all that is befouling it, and perhaps re-build it the way it was meant to be run. 

However, that is just the beginning motivation in my mind. I can see it going in a million different directions depending on our characters and the story as it plays out. The magic bomb, the way I see it, would hold less threat and give us an interesting starting point if our guys have been doing exactly what the organization was put together to avoid. See what I mean?