As a first approximation, why not? Behavior is generally all we have in front of us, plus any other assorted social signals. Internal mental states are invisible, as is the personal history of the individual. We might note a man beating a kitten on the sidewalk, and believe this behavior sufficient grounds to reduce this person to the category "dick", even if we remained unaware of his high intelligence, his doctoral paper on gender-inequality, and the fact his mother hates him.
As a first approximation, why not? Behavior is generally all we have in front of us, plus any other assorted social signals. Internal mental states are invisible, as is the personal history of the individual. We might note a man beating a kitten on the sidewalk, and believe this behavior sufficient grounds to reduce this person to the category "dick", even if we remained unaware of his high intelligence, his doctoral paper on gender-inequality, and the fact his mother hates him.