Is he? You've read a lot into the single sentence then.
My point is this, the guy didn't just get up in the morning and decided to it was a good day for a suicide pact. It's obvious you can never prevent a lone individual from repeating an attack, but to suggest that we 'just have to live with it' is to totally ignore the motivation. He had specific intentions and these were obviously gained through other sources, be it online or elsewhere. The security services are currently trying to stop radicalisation at it's root, and thank fuck both the security services and the and our military lads don't expect us to 'just have to live with it'.