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polymathwannabe comments on Open Thread, Dec. 28 - Jan. 3, 2016 - Less Wrong Discussion
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There was an ancient thread about sort of "extremely politically incorrect ideas that were nonetheless true", and there I noticed that one of such idea was that walls were effective at segregating people.
It would be interesting to see if hoverbikes and the like will be purchased even by the poorest, thereby eliminating barriers against immigration and segregation.
It's not a practical workaround. A slowly-moving airborne target is very shootable.
It surely is, but then you have to step from passive to active surveillance. But who knows, maybe in the future we'll have automatic turrets shooting at flying immigrants.