This is what I don't get. Defeating the ideology is, inevitably, something that will take generations and may never happen (who knows, it may even defeat us). So that leaves us with the more immediate job of mitigating the risk. So yes, doing as Berni suggests and interning the 1,000 currently on the watch list will have its social and political implications and may even serve to radicalise others. But surely, surely, surely it can no longer be morally or practically viable to let people continue to walk our streets who are known to support these kind of acts?