He desires to understand human emotion and be able to empathize with others, but he callously and thoughtlessly manipulates and abuses their feelings and trust. To satiate his curiosity, he will go to any lengths necessary, even if he must kill his own teammates, to achieve these ends. This kind of want, be it for wealth, fame, power, or sex, is what motivates all human beings for better or worse. Even when he is torturing Escanor with visions of his past, he holds no malice or ill will. For Gowther to understand human emotions is also for him to understand moral and ethical boundaries. The strong wording implies Gloxina holds some grudge against human beings, which is why she takes pleasure in their suffering. It would certainly explain why once noble and respected figures like Drole and Gloxina would turn traitor to their own races and join their ranks.
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