Proliferation of nuclear weapons to terrorist organisations is far more dangerous than proliferation of nuclear weapons to states, even states like North Korea.
One cannot have economic growth without security.
Of course the EU and member states must work to ensure that people moving from one country to another understand their obligations and their rights in areas like health, road safety and further education.
Non-proliferation will only work if all states are willing to cooperate, and that will only happen if all feel they are being treated fairly.
David Cameron says he wants to keep Britain in the EU, but his tactics are so divisive that, if he gets what he wants it will be at the price of huge ill-will in Europe; or if he doesn't, it will be at the price of increased anti-EU sentiment in his own party and in British society.
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