If stereotypes are accurate does it follow that discriminating on their basis is legitimate? Or can they be accurate patterns that we are obliged to ignore? Mus

If stereotypes are accurate does it follow that discriminating on their basis is legitimate? Or can they be accurate patterns that we are obliged to ignore? Must we make no assumptions and treat every stranger as a blank slate to be ethical? Or is it sufficient to update strongly on specific observations as they come? If stereotypes are accurate then the optimal amount of prejudice is greater than zero, as long as it is outweighed by postjudice.