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There is a case of Israeli-Egyptian border.

Israeli don't have to actively kill Egyptians because they, for almost all purposes, can't enter.

Nothing much wrong in having my daughter participate in some wall building.

In all current cases there aren't very many people trying to cross the border at once. If Egypt became uninhabitable there'd be 100 million people trying to leave. If it was even just 5% of that trying to get in to Israel then a wall or an army isn't going to stop them unless that army is willing to actively murder innocent people. I don't think any army on Earth would be willing to do that. Consequently a military solution isn't ever going to work.

You're talking about Egypt suddently becoming uninhabitable. That's not the case here. The case is that first it will be capable of hosting 100 mln people, then shrink to 90, then to 80, etc... Each transition will probably take five years. Of course there's a possibility of disasters there a wave of "sea people" may hit your wall.

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