Matthew C. Perry said:
Doesn't this contradict what you just said about there being "no clear line to draw?
Sorry, probably my mistake: mistranslation. The German "geistig behindert" to me means an illness, the translator I use gave it as "mentally handicapped". Maybe "mental retardation" is a better term, from
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"Mental retardation refers to substantial limitations in present functioning. It is characterized by significantly subaverage intellectual functioning, existing concurrently with related limitations in two or more of the following applicable adaptive skill areas: communication, self-care, home living, social skills, community use, self-direction, health and safety, functional academics, leisure, and work. Mental retardation manifests before age 18"
It seems the old definition of mental retardation was really based on IQ, but I think they recognized the limitations & fallacies of that definition, therefore since 1992 we have the modern definition. A low IQ in itself is not the same as being mentally retarded. Nowadays IQ is only used as part of the classification system of mental retardation.
There are people with low IQs who have obvious handicaps, and there are others who appear normal until a test reveals that they have an IQ of 73. The ghettos are filled with such people. And they are the reason we need extra police, social workers, and all the other sorts of outreach programs. These people might not need as much help as someone who suffers Downs Syndrome does, but they do need help. Otherwise, American cities begin to look like Haiti.
Extra police for reasons of lower IQ levels? Reasoning based on Haiti?
Haiti is actually a very good example of a dysfunctional education system (apart from other dysfunctional systems there). You can't blame the mentally retarded or handicapped for the condition of this particular society.
The ghettos you mentioned are not a very good example either. Where are these ghettos in Europe. With the exception of some French suburbs there are almost none. Ghettos are a sign of a malfunction in society. More police or social workers won't make ghettos disappear.
For some boring, repetitive sorts of jobs, a duller person might be a better fit.
I don't know where you live & how you define it, but IMO most jobs are boring & repetitive.
Apart from that, there are lots of jobs even people with an IQ lower than 80 could fulfill, if trained properly. Although I have to agree that for some of these jobs a special training would be needed.
Modern technology can make it even easier to integrate mentally retarded or handicapped into the work force.