I think you don’t have a clear picture of how highly functional low IQ people can be. This is in sense natural, since I mean how many people with an IQ of 70 do you know? Its silly but I sometimes have to remind myself they are by definition as common as people with an IQ of 130. They hold jobs and they manage to reproduce just fine, so they aren’t exactly the helpless drooling passives that popular imagination paints them as.
Also I think its often underestimated how different low IQ people of different types can be from each other.
Can a 13 year old learn to drive a car safely? Yes. Can he work in a factory? Yes. Can he run a farm? Yes. Can he be a soldier? Yes. Can a group of 13 year old children use lanugage at basically the same level as most human groups? Yes.
But how well would a 13 year old do compared to 18 year old on a IQ test? Not that well I suspect.
If the test got mislabelled as that of a 18 year old, what would be his estimated IQ? In abstract thinking he may not be that better than a 18 year old with a 70ish IQ but in many many other regards the test wouldn’t do him justice by putting him in the same category.
Black job performance is slightly better than what would be expected going just by their IQs. And Blacks with IQs in the 70s are generally on average more functional than Whites or East Asians with the same IQ. This has been the basis of some speculation that low IQ Whites and East Asians do worse on average because the sample contains not only people who are plain dumb, but a greater fraction people who suffer from other disabilities and more general brain damage (and/or underdevelopment) too, than is found in the group of IQ 70 Blacks.
Of course I am! Terrified about the majority of men voting too.