Then, of course, Hisao won't make a move on Hanako no matter what you do. He could arguably make a move on her some time after the neutral ending, with Lilly's prodding, or perhaps Hanako herself would make that move (I think Hisao's chances of taking the initiative would be higher in this case; Lilly's clearly aware that she's crushing on him, which he doesn't really know for sure)... but the story doesn't go long enough to see if that happens.
So rather than trying to max out her Affection stat for Hisao so she'll be receptive to an advance (isn't that how it can work in a lot of games?), you have to get her to advance on him. Which is the twist to her section of this game. White-knighting her or throwing affection at her like you're trying to get to the Woohoo phase on a neighbor in the Sims (or, well, many other games) gets you one of the worse endings. It's when he respects her enough to not overprotect her, when he respects her enough to let her be alone when she wants to be alone, and when she worries that she's done too good a job of keeping some distance on Hisao, that she makes the move on him.
She's not meant to be as simple as an average video game love (or sex) interest. She's much more of a trap for those kinds of people.
People blame Hisao because salvaging a friendship, and even a romantic relationship, is hardly impossible under those circumstances. Difficult, yes, especially the latter, but there are honestly much worse fights in your average friendship than one person yelling at another to "stop babying me, I hate you". The problem is that while the player might have considered that route, Hisao himself is pretty disgusted by her behavior at that point. And he's got some reason to be - while he was being a pushy moron about it that day, a good 98% of her observed behavior prior to that day indicates that she isn't as independent as she actually turns out to be. She shut him out completely, and when he was worried about it and showed it, she blew up at him rather than try to explain that she just doesn't want to be babied. Her behavior was the type of thing to make people worry, and when he showed how worried he was, well.Yandere Hanako is the worse fucking idea I've ever read for a character. The fuck was 4LS thinking at the time?
Anyway, can somebody tell me why people blame Hisao for Hanako's bad ending despite the fact you decide the outcome? Am I missing out or something or am I just retarded for thinking like that?
Not that she doesn't have reason to be angry in that ending, but Hisao didn't deserve how she treated him. And he is well aware of that. Unfortunately, he's not able to be understanding enough to forgive that. Being ditched by his friends after the first couple weeks in the hospital can't help that mentality either... he probably sees her behavior as just another betrayal.
As for her being yandere... she's emotionally unstable enough to cut herself off from the people she cares about and to then almost forget to eat, because she's too busy feeling survivor's guilt from an incident several years ago. And didn't her bad ending involve an incident of rape (or near enough to it) at some point?