That's probably true for individuals, but what about for crowds? If say most people in a crowd are angry some might have non-angry facial expressions because t

That's probably true for individuals, but what about for crowds? If say most people in a crowd are angry some might have non-angry facial expressions because they are thinking about a non-angry memory or they are busy trying to suppress a fart but wouldn't there still likely still likely be a much higher proportion of angry facial expressions than in a crown with a normal number of angry people?