if a person, due to for example some sort of personality disorder, was unable to feel empathy for other people, would that make it impossible for that person to be a passive class?

Alt Calliope. She’s isolated, matter-of-fact and really creepily emotionless. She is, nontheless, the one who makes the Ultimate Sacrifice for the Greater Good. Sometimes you don’t need to personally empathize with someone to know what the Greater Good is, and sometimes the passive, selfless way of doing things is not the best or even a good way to do things. Aranea’s attempt at hijacking the Session was selfless and kind of heroic after all.