Der Spiegel interviews Michael Flynn, former chief of the US Defense Intelligence Agency, on the origins of ISIS. Whether or not you agree with all of Flynn’s conclusions, it’s worth a read. Here’s snippet (boldface in the original):
Flynn: … yes, absolutely …
SPIEGEL ONLINE: … the Iraq war?
Flynn: It was huge error. As brutal as Saddam Hussein was, it was a mistake to just eliminate him. The same is true for Moammar Gadhafi and for Libya, which is now a failed state. The historic lesson is that it was a strategic failure to go into Iraq. History will not be and should not be kind with that decision.