At the end of the day, that's not what the game is about. Not only would the pacing answer storytelling suffer immensely if the writers were to shove in manifestos on systemically solving issues like rape/abuse, organized crime, big business/political corruption, hikikomori-ism, criminal justice reform, parental abandonment, and the dozen other issues the game tackles, those individual issues aren't ultimately the point.
Throughout the game, it's shown time and time and again that these bad actors in palaces are symptoms, not the disease itself. Every time the thieves steal a heart, they fix a terrible person, but the world doesn't actually get better. Kamoshida, Madarame, a TON of people knew the whole time what was going on, but looked the other way. The police were powerless to move against Kaneshiro. Everybody helplessly ran around in circles over Medjed. Futaba was gaslit into severe depression, and damn near the whole world gave up on her for it. Everything about the protagonist's brushes with the police are indicative of a culture that doesn't care who you are or what you did, just whether you stay in line, or get smacked down if you don't.
The thru line is that these big bad actors are just symptoms of an apathetic world. People see and know that all of these shitty th8ngs are happening around them, and they just 0lug their eyes and ears and act like if they just go about their daily lives, none of it matters. Its why the Okumura arc, while bloated near the beginning, is so important. Its the evidence that just taking out bad guys and being popular super heroes doesnt actually fix anything; regular people still dont care, and just enjoy the "fireworks." The phantom thieves, fully realized, aren't about solving all the world's problems, its about making you want to try.
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Doesn't take a lot of brains to be a good fighter.