I fail to see the connection between more immigration and improved utility. Notably most of the arguments in this regard tend to assume that people are completely fungible and that third-worlders will magically acquire the characteristics of the average first-wolder the moment they cross the boarder.
4skeptical_lurker
I went to a talk which presented the horrifying fact that immigrants are several times more likely to develop psychosis (varying from 2x to 10x dependant upon group, IIRC), and they theorised that some people have trouble empathising with people of other races, and this literally drives them insane. (Their other theory was that the cause is stimulant psychosis, but there wasn't evidence to support this as the primary cause)
I'd rather this wasn't the case. I quite like some level of controlled immigration, especially if they bring curry. But I worry that driving people insane is a fairly severe negative externality.
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