If you didn’t like that experiment, you will certainly not enjoy:
Suppose everyone whose IQ was below, say, 80 was to be transported to colonies on the moon Titan. After a few generations the Bell Curve would re-establish itself. There would at that point arise a new mean, and a new set of IQs below that dividing line.
Now: would that new mean be the equivalent of an Earth 80, or will it have shifted substantially? And if so, in which direction? Flynn suggests upward, but conditions on Titan are clearly not identical to those on Earth. (At least, not outside.)
Many racists have historically chosen that train of thought because they are in economic competition with other races. Their IQ isn’t going to be very high either. If this process continues, how sure can you be that your IQ would not make you subhuman?
Actually, I think that if I’m to be declared a nonperson, it’s going to be for reasons other than (approximately) measured intelligence, although I’m quite certain that “the good of society” will be cited as the official explanation, as it always is.