And killing Raphael and the demons who want to restart the Apocalypse is out because...?
I am not against doing whatever is necessary to ensure the safety of those here. But the kind of power you're hinting at that these souls can give has me worried. I have not been alive long, compared to some of my brethren back home, but I have heard stories and tales of how such a power is dangerous and can lead to something bad happening, usually because something powerful was after that power.