Jade Curtiss is someone who has himself regretted the introduction of dangerous technologies in this world. But as it is, it seems that any sabotage would be too late to stop the shift bomb technology from existing in general. Beyond that, taking into account the invasion and Bil's reports about the sad state of the war, it seems like the usage of the shift bomb is pragmatically the best option towards truly advancing in the war. A chunk of Cultist forces will be taken off the map for the forseeable future, which is an enormous boon in a war where enemies otherwise seem to be endlessly multiplying.

Jade also sees the value in allying with Bil and the Iron Eye. It opens the door for more positive alliances outside of the organization, which could be beneficial in improving their standing in the world, rather than playing by the Malnosso's rules. Jade had actually intended to ascend to a Malnosso position earlier; however, along with his participation in this likely destroying those chances, he has grown disillusioned with the organization in general now that he's seen their history of failures and horrors. And beyond that, Bil has told him that the Malnosso are bound to a heroic code which keeps them from making the pragmatic calls necessary to truly win wars.

Overall, Jade is choosing to throw his lot in with the shift bomb. He's sure he can stand being attached to one more unforgivable act, especially considering the number of lives that could be saved from potential Cultist attacks. And, it is a step closer to true independent action.