Director of Central Intelligence John Brennan stated,
“It’s a long war, unfortunately. But it’s been a war that has been in existence for millennia, at the same time—the use of violence for political purposes against noncombatants by either a state actor or a subnational group.
Terrorism has taken many forms over the years. What is more challenging now is, again, the technology that is available to terrorists, the great devastation that can be created by even a handful of folks, and also mass communication that just proliferates all of this activity and incitement and encouragement. So you have an environment now that’s very conducive to that type of propaganda and recruitment efforts, as well as the ability to get materials that are going to kill people. And so this is going to be something, I think, that we’re always going to have to be vigilant about. There is evil in the world and some people just want to kill for the sake of killing…This is something that, whether it’s from this group right now or another group, I think the ability to cause damage and violence and kill will be with us for many years to come.”
Micah Zenko summarised Brennan’s whole speech:
To summarize, the war on terrorism is working, compared to inaction or other policies. But, the American people should expect it to continue for millennia, or as long as lethal technologies and mass communication remain available to evil people.