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Held to the proper degree xenophobia is a normal, healthy instinct in all cultures.

I don't see how not joining a field just because it consists of certain amount of foreigners is a healthy, normal instinct.

It is because of secondary effects -- larger supply of foreign workers drives down the wages, now and in the future.

Except the whole "software eating the world" thing that might be the exception that proves the rule.

"Held to the proper degree xenophobia is a normal, healthy instinct in all cultures"

That may be, but I'm not sure you know what the words "normal" "healthy" or "proper" mean.