4. No indication it's IS. The banner isn't the one they use.
Oh, that makes all the difference ! Because if the terrorist wanted to proclaim he was a member of the Islamic State, he could have made his way to a local gift shop and bought himself the correct flag.
DUmbasses... Did you stop for a moment and consider that just maybe this guy used a similar flag he could find or perhaps already owned, instead of walking into a local retailer and asking them if they had an IS flag in stock ?
And if you think he could have just made one, why dont you give it a shot ? You will learn that making a good looking flag isn't easy unless you already have skill working with fabrics.