As written before there are good reasons why one should be careful to keep the legal and the intelligence issue distinct:
1) It would be criminal not to monitor their activities closely because their decision and their stay proves that they are much more likely to use violence to achieve their political goals compared to a control group. That does of course require ressources but likely a lot less then reaction 2.
2) Creating now harsh laws to throw them quickly into prison for a considerable amount of time is not only problematic from a legal point I guess but requires a lot of ressources for a long time.
Generally I'm not surprised that the British gov has used an additionally path in many cases, stripping holders of two passports of their British one. Once again it seems to me that this raises legal questions but can be a 'cheap' solution for the respective group.
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