maybe their reason to not shoot ordinary student is because they don't want to lose their support? (kinda) if they are programmed to act as a real human being, of course they will be angry to the group that injure their fellow friend or even themselves, so if students aren't fond of SSS, they will not come to their concert (the girls dead monster), etc. Which means lose-lose situation for them. heck they might even support student council to disband the SSS (maybe).
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