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They have something to kill for. They have the numbers: 3,000 on the MI5 list, and 20,000 on the broader list of which the Manchester bomber was one. Access to bomb material is moot, as they often go for different ways to cause death.
Terrorist is a meaningless coverall, the Irish Republican Army, the killer of Jo Cox, whatever you want to call the muslims inspired to attack the west, but I'd say these are closer to the IRA than some random nutter.
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Yeah, okay, there's more of a network than with your Copeland types, that's fair. But there's not anything like as much sympathy for them or their cause as there was with the IRA. Which I think is a bit of a taboo subject, but Christ - it was completely okay in American culture for a couple of decades to openly profess sympathy for them or even send money. ISIS et al's pool of sympathy is i think proportionally much shallower.
h2o
What makes you think they're more like the IRA?