Yeah, it's Harry Potter. Social change is the enemy in the book. At no point does anyone try to improve anything in the book. They don't even oppose evil that much. They just oppose it when the existing evil tries to go too far by the current standards of evil.
Some comments complaining about the house elves status don't see how well it spills into real life.
Society didn't care in the books, society doesn't care in real life. Change was slow in the books, change is slow in real life.
Rowling was accurate as fuck in this regard.
JK Rowling literally wrote a slave caste that loves being in servitude. Even putting aside the transphobia of her most recent past, the Harry Potter books are not leftist friendly.
Harry was billed in early books as this "Anti-Voldemort", who'd lead Wizardy to a gilded age and do great things... But JK Is a Status Quo loving Neo Liberal and can't imagine a better world. In all of her works the system is corrupt, but it's fine because the only thing that would make it go wrong is one bad faith actor (In this case Voldemort), who will stumble upon some obscure rule that undoes him. (In this case, killing Harry who was at that time the last horcrux)
Harry becomes a cop and doesn't change the status quo because the world as it is is the best JK can imagine it.
It's kind of like how no one did anything about Trump, they kept waiting for him to trip over some rule that sends the system crashing down on him, but it never happened.
It never happened because the system is powerless to punish anyone, because the system is just an idea, it is immaterial.
The Electoral College isn't going to magically vote for Hillary because it recognizes Trump's evil. People have to recognize his corruption and change the system to combat it...
The Democrats never learned they couldn't just wait for the System to punish the Republicans after they accumulated enough good/bad boy points
To be fair aurors seem to be doing the job of detectives/cops/militia/commanding officers/military police/federal agents/CIs/Deputies/Marshals/Troopers/ Dementor management/whatever
It's not just a cop. Besides the guys seem to be paid decently enough and deal with the most nastiest of the nastiest shit in the magical world. It's a miracle people decide to do it, given the mortality rates it seems to have and the kind of bullshit they need to deal with