Comment by Ember Cook on Yuki

@Yuki   we got the backstory because it explains the fact that he was messed up in the head and he had issues and an inability to understand love because he was never once received it the reason he treated Dan the way that he did was because the setup for his life and the way that he was built was that he always had to survive on his own and that any kind of kindness Dan ever showed him was fake he spent his entire life in a situation where he was constantly being hit and beat this would definitely mess up his mental and make it impossible for him to understand how to treat others much less so kindness. He lacks emotional maturity and he did not understand how his actions affect others this is constantly showed throughout the series that he actually is completely unaware of the type of abusive or toxic person he became because of what he went through it's simple psychology no it doesn't excuse the wrongdoings he's done. But it does explain the character and it makes perfect sense people who don't go through trauma have no capability of understanding this or even showing empathy. Most bullies in life are actually victims themselves that they don't know how to regulate their emotions and what they do is they end up taking it out on other people.