There's certain topics that people are scared of discussing, but that tends to leave the topics in the hands of the worst people. One example I came across this past month is group differences in genes and traits among humans. These aren't "racial differences", as they aren't different races, but simply the observation of the same patterns of differentiation we observe in every other species being observed in humans. There is no superior trait, but something akin to difference in feather color.
However, we are so afraid of discussing difference so as to avoid the ugliness of the past that these discussions only happen in tiny science groups and online in racist, supremacy groups. There's no reason that something as common as black Americans and white Americans having different hair or that Asians have different earwax from westerners should be left to hands of neonazis to form the discussion on. Our belief in equality, I feel, largely comes from a jeudo-christian view, but as our scientific view become more prominent, we'll have to involve real group differences into our value of equality.
