If you look over the course of a hundred years, I think the gradual erosion of the consensus that's held our country together is probably more serious than a few bearded terrorists who fly into buildings.
But if there's an erosion at home, you know, Thomas Jefferson warned about a tyranny of an oligarchy and if we surrender our democracy to the tyranny of an oligarchy, we've made a terrible mistake.
It depends on how you look at culture. If you look over the course of a hundred years, I think the gradual erosion of the consensus that's held our country together is probably more serious than a few bearded terrorists who fly into buildings.