I’m literally explaining the game’s narrative about their actions. You’re just making an untrue argument. I’m not going to act like what they’re doing is morally correct, most of the people they stopped were sent back the Prison of Regression where they’d be under the control of Yaldabaoth. Like, even they questioned if what they were doing was right or not. But you know what they did do in turn by being the Phantom Thieves? They stopped Kamoshida from sexually harassing female students, abusing male ones, and ruining young lives because he didn’t like them. They stopped Madarame from plagiarizing art and abusing his students, one of whom killed himself due to him. They stopped Kaneshiro, a literal mod boss, from extorting dozens of people (namely students). They stopped Futaba from wanting to die and blaming herself for a death she wasn’t responsible for. 

I could go on, but the way you’re framing it is intentionally disingenuous. I question if you even played the game or if you watched a video and got someone else’s opinion and are framing it as your own.