[FeepingCreature]

Right, but this opens the door to there existing, in theory, racial genetic differences causing variation at the human scale; whether or not these map to racist stereotypes, it becomes harder to argue against them because people can no longer discard them by just denying the concept of racial variation altogether. So they actually have to put the work in to demonstrate that they're untrue, invalid or inapplicable.

Anything that makes it harder for people to attack the enemy is interpreted as aiding the enemy.