I've said this before, but in the wake of the Paris terrorist attacks, it bears repeating.
The single biggest threat to humanity isn't a religion or an ideology — it's the notion that there's nothing left to lose.
People who are invested in our institutions don't set out to destroy them. People who have hope in their lives, and who have faith in their fellow humans, don't engage in suicide bombings. Hopelessness allows fanaticism to take root.
As a planet, we have to ask what underlying conditions breed this brand of nihilism, and then figure out what to do to curb them. Anything less, and we're attacking the symptom, not the problem. I don't know what the answer is — or even if there is one answer — but the question is at least worth considering, no matter how uncomfortable such introspection might make us.
If only we could have a world that everyone considered too beautiful to attack.