I can see the point, but with the IRA, violence was a way getting to the negotiating table. With Islam no such negotiations are being sought. The army command also knew the vast majority of the top boys and the soldiers of both catholic and protestant paramilitaries , a lot of the top brass actually wanted a night of the long knives and rid them all out, but Westminster baulked at the idea. I heard yesterday that MI5 have 3000 potential jihadi under surveillance at a cost of 9 billion or million (I thought I heard billion but seems a lot) year, so its not a small problem, with no small solutions
It's undoubtedly more of a challenge from a logistical standpoint, because most of these idiots aren't part of some shadowy, worldwide group no matter what ISIS suggests...they're just angry people who found something that tells them they are right to be angry, and tells them that their anger can be used for violence in service of a greater cause, often with no direct connection between the radicalizing force and the individual. That's hard to track, and harder to prosecute.
That's extremely difficult to handle, but it's not an Islam problem. It happens to be the exact same model followed by modern white supremacists, as an example; they are more likely to meet openly, but self-radicalization via the internet has become the biggest recruiting tool for that community of ****s, too. Dylann Roof, who shot up a black church, had his general anger focused by reading white supremacist material online. Alexandre Bissonnette, who shot up a Quebec City mosque, was timid and bullied in life but found power as a far right troll online, and eventually stepped up to mass murder.
There's your problem: angry (usually, but not always) young men, not religion or creed or race. Disaffected and believing that the world has wronged them, generally narrowing that down to a self-selected cause and target for their violence Westerners, in the case of the Islamic State wannabees. Black people or Muslims, in the above two cases. Women who won't sleep with him, in the case of Elliott Rodger in California, or feminists (who won't sleep with him) a generation earlier with Marc Levine in Montreal. Classmates who didn't afford them the respect they believed due, in countless numbers of school shootings. Their stated causes may have differed, but the root cause was generally the same.
Which isn't to say that all attacks fall into that category...many of the larger-scale, more organized attacks
do have political aims, as the IRA did before them.