I wouldn't say they were necessarily innocent.
Blue had worked his mindbreaking/psychology/cult-of-personality magic or whathaveyou on them obviously, and had transformed them into true killers and his slaves at some point (from their "eyes" and how they were willing to kill and die at Blue's order). They were already long gone from any sort of salvation before Murasaki killed them (which is the tragedy; all of Murasaki's memories of them were already tainted with Blue's evil unknowingly).