Each one of us is susceptible to a variety of ways of categorization/inclusion in various populations. There is commonly variation within every population when it comes to some characteristic.

Consider the variation of “height” within the population of “10 year olds,” or the variation of “luck” within the population of “people who play roulette.” Variation is NORMAL.

Thinking ALL people in ANY population, merely because we’ve lumped them into that population, must be the same with regard to a particular characteristic (or set of characteristics) will inevitably lead us astray.