Today's recommended reading:
Dexter Filkins' long and revealing report on ISIS in the Sept. 29th New Yorker. In the end, you might conclude that there is no bumper sticker answer to the threat, that it is a nasty condition that won't go away soon and will still be around for the next president or two to confront. This is an enemy active around the world, with even strong ties in Australia. Don't look for simple answers. There are none. Some of our friends are our enemies, and some of our enemies are our friends but unfriendly to others.