Since you are taking it to extremes it means exactly this..
If you *KNOW* that your problem is foreign nationals (which we will define as everybody not born in the country) then if you throw them all out, including you but not your son, and refuse to let any more in, then however ridiculous and unfair you have been you have solved your terrorist problem.
If you *know* that your problem is your own nationals, so including your son but not you, then what do you do?
What now will your own extremists call for? How now will you feel better about your own country? etc. etc.
France has 60,000,000 people. more than 50,000,000 were born there. If their problem is people not born there, then they have to watch or throw out 10,000,000 people that they can identify (although perhaps not find) and they can stop the problem getting worse.
If their problem is the 50,000,000 then what do they do?
Its all very silly, but in the scheme of things that should make countries shudder it seems to me that a problem with your own people is more scary than a problem with immigrants.
Anyway, it was only a small point and not worth further discussion
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