She is not responsible, but she IS part of the cause. Those who lost people precious to them will want revenge, will hate her, but are they evil? Or are they just like any normal humans in that scenario? They would ask: Why did she, a part of the cause, is saved, when their father, their mother, their brother, their sister, their son, their daughter, who haven't done anything, is not? What make her so special? Those are the questions the survivors can and will pause. Shirou CANNOT answer those questions.