@Fermi I mean, yes, what you said was true, but I think it was implied that not every death MC went through was intentional. During some lifetimes, MC avoided Shin, so obviously he would have this unresolved hatred towards him—even when he did talk to him, he didn't cling onto him, like he did in this lifetime, meaning, he would never understand what caused Shin's hatred towards him, and what eventually led him to killing him. Basically, Shin was oblivious to his own actions, and as a kid so young, it's obvious he would be oblivious, but that doesn't mean the damage wasn't done. As for his sister, he was quite literally, going through a traumatic response and it wasn't valid of him to neglect his sister when she was going through hard times, but whenever he was going through a hard time, he wasn't able to express it in a non-violent way, most likely because of the way his mother treats him—so unfortunately, in this case, I feel like it's expected for him to feel and react this way.
Like obviously, what he did was not good—but, both his sister and Woori have flaws too!
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@Sun01 Bro he literally killed a human being. The MC tried to help him, tried to be friend...