i understand these are fictional characters but i'm only speaking logically. this is like saying we can't blame ted bundy or john wayne gacy for their crimes bc they had a horrible upbringing that taught them that what they're doing is ok, like no they are still horrible ppl who although weren't raised the same as us, understood that what they were doing was wrong but kept doing it bc it's just what they like to do. sangwoo doesn't care that he kills.
im dyslexic, in case i make any goofy mistakes :p