Look, ISIS = dumbasses. Bunch of guys standing around. Woosh-boom. Paveway hits them courtesy Predator lazing. Survivors are like “wtf just happend?” Solution: “K, let’s regroup over here in this building” Boom - JDAM Snakeeye.
They’re FKN MORONS.
I wouldn’t underestimate them as you seem to imply. They nearly toppled the Syrian regime with its trained and well equipped armed forces. Syria has tanks, APCs, attack helicopters, bombers, chemical weapons (which they have used) and so on. Syrian president Assad’s father wiped out the entire village of Hama, 40,000 people in all, to put down the Muslim Brotherhood insurgency in 1982. But baby president Assad had to call in the Russians in 2015 for help (a foreign policy disaster on our part, fwiw) to regain the upper hand against ISIS.