Um, no it really isn't. If it was every jihadi would be using explosives but they're not are they. The common weapon is low budget knives and vans.
The easy to make explosives from materials at Tescos are either more dangerous to the user in transportation or are prone to fail as in this case and in the Barcelona attacks.
The actual explosives that can be turned into a malleable plastic which can be transported, he'll even nitroglycerin require hard to get materials such as 99.9% nitric acid. Which despite YouTube videos if very hard to make at the right distillations.
Knives and vans are far more accesible so of course they are more prevalent than explosives, but you are overlooking the overriding point which is that explosives are so easy to make (relatively) that all you can really do is monitor suspicious individuals, not prevent their synthesis through legislative means.
"Easy" is a relative term I admit. But when I was a relative beginner at chemistry I could make fuming nitric acid following the youtube videos without great difficulty. By "easy" to make, I mean a person who is intelligent and versed in the sciences can accomplish it without having connections or large financial resources.
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