The problem here is not study of genetics, but the tacit assumption that society must be constructed for the elevation of whatever the 'best' is, and the suppre

The problem here is not study of genetics, but the tacit assumption that society must be constructed for the elevation of whatever the 'best' is, and the suppression and destruction of the 'worst'. The rest is just where you place the line, and if you grant that, you are establishing the threshold for genocide. Things would be a bit simpler if the argument wasn't 'never talk about any differences among people', but 'never place that line, because society is not constructed for the destruction of the least among it'. It is NOT an inevitable requirement that society is constructed for the destruction of the least among it.