The mayor of London, writing in the Guardian, has this to say about the practical steps we must take in order to deal with the terrorist threat. He starts off: “We must now redouble our efforts to destroy the poisonous ideology held by these extremists and terrorists to stop another incident like this happening again.” He goes on to say: “We must renew and improve the government’s anti-extremism programmes, so that they are more effective at rooting out homegrown extremism. We must build stronger and more resilient communities that can resist the extremists. And we must give our police and security services the resources they need in order to keep us safe.”