Security guarantees are impossible, but too many dangerous individuals are falling through the cracks.
It cuts shuts down the chance for dialogue.
One of the London Bridge attackers was linked to the extremist group.
And it's not just Muslims who need to start them.
An expert explains that such claims are probably more calculated and careful than you'd expect.
Once we switch from focusing on total terror deaths (or attacks) per country to terror deaths per capita, relevant conclusions about what drives terrorism change dramatically.
The way we talk about attacks is actually helping the extremists' monstrous cause.
People stand together in solidarity, but it belies the more complex story of human response.
It's practically impossible to protect sites like London Bridge without affecting public life.
National security is a more complex issue in the UK these days, after a decade and a half of unpopular wars and years punctuated by regular, deadly terrorist attacks.
It's difficult for security services to anticipate such a low-tech attack.
Tightening security, impact of foreign wars – Britons have heard it before. The UK now has to dig beyond rhetoric to ask why some care so little of their own lives to take those of others.
The attack in London was horrific but armed officers were on the scene and ending it with astonishing speed.