Some people might not be saints but they don't deserve to spend the rest of their lives in a prison. [She usually doesn't bother with them unless she really needs to prove a point, but she doesn't feel like backing down right now. Something about this guy's smugness.]
On top of that, some of the people who are here spent their lives saving the lives of others back home. The small things they might have done does not outweigh all the good they do day after day. [Night after night to be specific but she rather not expose anyone.]