Or prevent the radlicalisation centres like Pakistan and others from accepting oil money to fund their training camps. Which we have no right to do so as they're sovereign countries. The best we can do whilst minimising the amount of change we have to make is probably the control scenario I described above. It still infringes on existing liberties, but it does so for people who are going to known dodgy countries, and it allows existing Muslims the option of either staying with their western countries, or follow their Islamic identity abroad.
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