For God's sake I am tired of this argument Cinder's act was in self-defense. With her dust and glass abilities Cinder could easily detained Pyrrha by just incasing her in a dome of glass or locking up her limbs. And even if you make the argument Pyrrha would have broken out Cinder could easily use her powers to block off Pyrrha's supply of oxygen until she fell unconscious.
I've seen videos where police officers are taught to shoot suspects in the chest even if they're unarmed. The idea is you want to stop your aggressor before they do you harm. You have a man on the ground and if an cop thinks he's reaching for a gun in his pocket he'll shoot him in the chest. That's the coldness of reality of the world we live in but this is FICTION. These events are planned out and constructed by another person at the helm. The writers went out of their way to showcase the level of Cinder's cruelty time and time again.
She doesn't need sympathy to be humanized. Jessica says Cinder was personally disgusted with herself with turning herself into a monster by the Grimm prosthetics she accepted from Salem but couldn't help herself. It adds a level of complexity to Cinder's feelings giving the feeling she's more than a two-dimensional villain. Cinder is a character that feels conflicting emotions but none of those conflicts are remorse for hurting others. She gets a fucking high having power and lording it over other people. Hell, she targeted Weiss solely because Jaune didn't care if she hurt him. Cinder had no power over Jaune in that situation until she threatened his friends.
I guess I'm one of the few who want to see her backstory. Not because I want her humanized, but from her fairytale origins, I suspect she must have come from a humiliating and abused background. I want to see what CRWBY has in mind that could drive someone so low and make them so spiteful. My curiosity comes from a place of perverse fascination, not empathy.