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Perhaps, but then bombs could just be detonated in open public squares, playgrounds, etc - it's actually surprising they're not.

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Indeed, you cannot protect any place when more than a few people gather.

You have to stop the issues at their source: why did people who were born and raised in Europe radicalize in just one or two years? And why did the community they lived in not see or report that this was happening?

While I agree, I think we can admit that doing so will take some time. Would it not be appropriate to have compensating controls in the meantime?

The trouble is, temporary compensating controls have a history of becoming permanent once in place, so you need to be absolutely sure you want those controls forever.

That's a good point, and while I hesitate to think about this terms of pure risk management, the same stuff happens in my company.

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