If Keith's Galra side is what makes him have this...

If Keith's Galra side is what makes him have this anger issues... How nice of a guy would he be if he was 100% human? – from Anonymous

dent-de-leon:

Actually–I don’t think Keith’s struggles with his emotions make him any less “nice.” If anything, I think he’s actually kinder because he’s hurting so much and still makes a conscious effort to try and control his temper and clearly regrets lashing out at others. Look at when he’s upset about Shiro’s disappearance–when he feels like Shiro left him and he know’s it’s not Shiro’s fault but he’s still so overwhelmed and says things he doesn’t mean. The reaction is immediate. As soon as he speaks, he looks devastated
During his paladin vlog, he apologizes multiple times for letting his anger get the better of him. “I am…sorry. I am so sorry I, I guess—I have a bit of a temper, so…“ During The Hunted, he also expresses remorse for giving in to his emotions:
I think it’s also worth examining why Keith’s temper usually flares up. The common denominator is usually either 1) innocent people are in trouble (most likely under the rule of a corrupt leader)
2) Shiro in particular is in trouble,
or 3) he’s grieving Shiro and his teammates don’t allow him that time to mourn or continue searching
Now, at the end of the vlog, Keith gets up and storms off. The only other time I could really think of where he actually gets up and leaves in a fit of anger on the spot is in Changing the Guard. All day he’s been tense and frustrated because no one else is willing to really acknowledge that Shiro is in serious trouble. “We don’t have Shiro either. Everyone seems to have forgotten that.” He feels like none of them cares about Shiro like he does, like they all just gave up on him and Keith is his only hope. And he can’t walk away from Shiro, not when he means so much. Anyway, what I’m getting here is–if in the vlog he storms off because he can’t hold back his tears anymore, does that mean he cried after this scene too?
Even the way he slams his hands on the table before taking off is a thing in both these scenes
So anyway, what I’m trying to say here is–Keith’s anger isn’t from malicious intent. Not really. It comes from pain, compassion, love–it’s what happens when he cares too much and someone tears his world out from under him. He’s not a bad person, and I certainly don’t think Keith is even an angry person. Being galra doesn’t make him “meaner” or more aggressive, it makes all his emotions more volatile and passionate. Which would also explain his singularly devoted loyalty and adoration for Shiro, his sense of chivalry, his intense fear of abandonment, and so on. His feelings are all his, they’re just focused to such an intensity that he has difficulty managing them. He gets overwhelmed, and he lashes out. He’s trying his best to cope and I wish the universe was kinder to him