Waleed Aly is using an old propaganda canard, favored by journalists and opinion shapers because of its appearance of pseudo profundity. Like many superficial tropes, it's nonsense - along the lines that a victim ought to oppose an an action because, it is claimed, that action is what his enemy wants.
What absurdity in this line of so-called reasoning. You see, a targeted society does what is necessary to do to protect its security, whether or not it comports with the enemy's irrational, perverse, or self-defeating wants.
Japan and Germany wanted war in 1941, but only a fool would have blubbered that the US should have promptly offered a conditional surrender to 'deny' them their wants. Hitler wanted to dump German Jews on other non-European nations, but that does that mean the US (among others) were justified in not accepting "what Hitler wanted". Saddam did not want iraq to be invaded in either gulf war, but only a moron might think that somehow creates an argument to invade.
And ISIS had not hidden what they want behind fanciful sociological rationals - they want a return to a 7th century view of Islam and jihad - convert, obey, or be put to the sword. They want infidels dead. They want to behead anyone not converting, and anyone else (including children) that violates one of their religious injunctions. What about their wants don't you get?
There was a twitter message I read, along these lines, that exemplified the delusional excuse making mindset of the Western liberal:
ISIS: We want you to convert or die by beheading...your choice.
Liberal: Oh no, you just want to provoke a war.
ISIS: No, we want you to convert or die.
Liberal: Oh no, you really want is for us to punish Muslim refugees to provoke division.
ISIS: No, we just want you to convert or die. Have you seen the infidel heads on our stakes?
Liberal: I am sure you just want to drive a wedge between the West and the Muslim World.
ISIS: Actually, we just want to kill you by beheading, unless you convert.
LIberal: No...no...no. You're just frustrated by a lack of jobs and climate change...right?
ISIS: No, we want you to convert. So will you?
Liberal: Well, no because that's what you want.
ISIS: Okay, you die. (swipe).
Got it?