Former UK diplomat Rory Stewart says the world is safer today than it was 20 years ago, but that terrorists still pose a threat to international security. Victories for jihadists in Iraq, Syria and now Afghanistan could ultimately lead the world towards more global terrorism. As if the Taliban retaking Afghanistan wasn't enough of a blow, the ISIS-K attack on the Kabul airport may be a sign that the country is on its way to become a safe haven for terrorist groups yet again.