I think what a lot of comic book writers fail to understand is that the 'Two-Face'/Scarvey personality isn't a force of evil, or a parasite clinging to Harvey's back, or something that needs to die by the hands of surgery and therapy.
If we go by the timeline where Christopher Dent was an abusive, alcoholic father, this being a deep root in Harvey's plethora of mental illnesses, Scarvey is usually the alter that formed to protect both Harvey and the body. Like seen in Two-Face 2024, Scarvey fronted whenever they went back to their father's house, only to be stuffed away in the back of Harvey's mind when they moved out.
Nearly every other storyline following the 'abusive father'-route shows little of Harvey's mother, implying she either left him or died. This means Scarvey fronted a lot during their childhood, which brings me to my next point; Bruce should not be written as one of the many trying to get rid of Harvey's alters, because Scarvey fronting the most during their childhood means Bruce befriended both Harvey and Scarvey. Maybe he acted different sometimes, but a child wouldn't be able to discover that his best friend had two identities, not even a kid as clever as Bruce. It makes zero sense that he'd try to connect Harvey's new interest in crime to an alter that has been there for nearly his whole life, and it would make even less sense for him to try and get rid of the alter that specifically formed to stop Harvey from being hurt or physically hurting himself, like shown in the image below (and in many other issues).
Aside from that, Harvey isn't exactly an angel. In hardly any continuity did Scarvey overtake the system completely, and for Harvey to stuff him away during his college years, he'd have to be stronger or at least equal in strength to Scarvey. This also means that he could've turned himself in whenever Scarvey is dormant, but he doesn't. Why? Because he's as much of a fervent servant of 'true' justice (the coin/chance) as Scarvey is. Maybe he's more righteous about it, with his lawyer-like speeches about chance being the only fair factor in the universe, but he believes that the balance between good and evil lies at the hand of a coin all the same.
They really are two sides of the same coin.
