What seems to come across is that there are two extreme types of immigrant. There are the leeches, and there are the ones who bring needed skills to the country. The British NHS would be one hell of a lot better off without he former, but would collapse without the latter. Both types come for selfish reasons, however. They all want to make more money and have better quality of life.
I, personally don't think there is much justification for either type to be allowed into developed countries like ours. We obviously don't want the leeches, but removing the skilled workers from developed countries* is hardly going to help. If anything it will bring us more illegals, by exacerbating the problems in their countries.
No a wall that long will never work. If people are desperate, not even a wall with gun emplacements and the threat of being shot will deter them - Berlin.
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