Is that really true? Young children perhaps. IME most folks learn that people are complicated at least by adolescence once they realize their parents are imperfect.
Of course there is the ever present temptation to resort to tribalism, which is pretty binary: in or out.
For example, the general attitude shift about Elon Musk following that cave rescue incident. Before that he could do no wrong, and after that he could do no right.
Of course there is the ever present temptation to resort to tribalism, which is pretty binary: in or out.