I Don't Get Why Some People Defend Isidora?

It's made explicitly clear that Isidora wasn't just removing pain but also emotion. Not to mention that she was experimenting on unwilling test subjects and students?! We see what the stored emotions can become, it's obviously not sustainable. How can anyone defend Isidora? Moreover, how can anyone say that the keepers are in the wrong for trying to safeguard a powerful form of magic from falling into the wrong hands. Is there something I'm missing?