Britain’s Prime Minister, David Cameron, has a thought on the matter.

[A]ny strategy to defeat extremism must confront, head on, the extreme ideology that underpins it. We must take its component parts to pieces – the cultish worldview, the conspiracy theories, and yes, the so-called glamorous parts of it as well.

In doing so, let’s not forget our strongest weapon: our own liberal values. We should expose their extremism for what it is – a belief system that glorifies violence and subjugates its people – not least Muslim people.

We should contrast their bigotry, aggression and theocracy with our values. We have, in our country, a very clear creed and we need to promote it much more confidently.
…
[T]here is also the question of identity.

For all our successes as multi-racial, multi-faith democracy, we have to confront a tragic truth that there are people born and raised in this country who don’t really identify with Britain – and who feel little or no attachment to other people here. Indeed, there is a danger in some of our communities that you can go your whole life and have little to do with people from other faiths and backgrounds.

All of that applies here, too, can this administration—or more likely, its successor in 18 too-long months—find the moral courage actually to apply it.