You beat me to it, Thryleon, and much more concisely than my edit ;D
A prejudice or bias may lead to the correct conclusion on the odd occasion but then again a broken clock is right 2 times a day. Maybe someone who believes all black people will rob you on the streets may benefit by avoiding a particular black person who intended to do so but that doesn’t mean the prejudice is proved even if it’s in line with the observations of suspicious behaviour in that one instance.
A prejudice or bias may lead to the correct conclusion on the odd occasion but then again a broken clock is right 2 times a day. Maybe someone who believes all black people will rob you on the streets may benefit by avoiding a particular black person who intended to do so but that doesn’t mean the prejudice is proved even if it’s in line with the observations of suspicious behaviour in that one instance.