Harun-el Splits The Bad And The Good
There's so many interesting ideas when it comes to red daughter being the evil half of Kara. She hasn't experienced the loss that makes superman and supergirl so willing to save her people. All she remembered is Alex and Lena so she doesn't remember any hurt. There's the obvious one too, that because she is maluable that's what makes her dangerous which is very much true but also if you look at her she has no sense really for self preservation. Going to help the boy and protect him is definitely a good thing to do but later on when she saves Kara she proves that she values herself very little. The reason why she's evil, I think, is because she doesn't pretend to be happy like supergirl does. What's the bullshit for dumb movies? She's ruled by her emotion. This is a good think in Kara's case but when she was out of control as red Kara that was a different story. Supergirl is kind of just numb, doesn't prioritize herself but red daughter doesn't care enough to hide it. She's instinctual, depressed, scared and overall pretty uncontrollable. That's why she's the bad side, or you could argue that supergirl was the bad one.
If Supergirl was the bad one that could also be argued. She's allowed herself to become human, something she condemned after Mon-el left. Now in season 4 she delve deeper into hiding who she was because of all the xenophobia and whatnot but what if part of the good and evil split ideal is what the person considers evil. Kara really, is the only one who remembers her history on her planet. Sure, Argo is still there, she's got her cousin and mother but she's ignoring further who she is and that may be evil to her. (Could also be an interesting case as to why RD could be evil and doesnt remember shit.) No one ever really considered Kara, 'normal' kara could be the evil one but isn't she acting a bit more sweet now that she's whole again. Just everything in season 4 could be a potential for the belief that supergirl was the evil split of the pair. We know that Kara really isn't that evil (red kryptonite is whack) but she was hurting so much, constantly pushing people away. Even if her actions weren't completely her choice they could still be considered self sabotage.
All in all, I don't think there was a good and evil split but maybe a 'good' and 'bad'. It's all really interesting to look at.
