You can read the rest @
This is a rather tenuous connection since the US and its agencies fund and arm just about everyone they can. That doesn't mean they put this gun in the hands of these terrorists.
A better question might be - why is US foreign policy based on bullying and violence instead of diplomacy? Either the morons in DC don't believe in "blowback", or they want to create it so they'll have an excuse for even more violence.
Either way, they are AFU.