Sure you can. It doesn't happen within one generation. Most of the time you have to kill the current generation that perpetrates the ideology while concurrently making the specific ideology unappealing to the next generation.
A perfect example would be the IRA in Ireland. The next generation was simply convinced that the IRA was not the way to go and they had better options, thus the fighting stopped. The same must be done w/ Islamic Fascists.
Even the IRA understood that it was about Hearts and Minds. It took em nearly 20 years to perfect it once they wised up and stopped blowing up their own neighborhoods and focused on London instead.
They realized that killing innocent Civies wasn't helping their cause. So what'd they do? They started calling in the bomb threats a couple hours before they were supposed to go off.
That way they could damage the rich peoples infrastructure, but with no bloody bodies for the Brits to post in the newspapers.
Anyways, your premise is off. PIRA cells were operating in every big English city and the Special Branch just wasn't catching them. As long as the supply of fertilizer held out, the PIRA was sitting pretty. If they'd wanted to, they could have put no warning bombs all over the London transit system and killed tens, maybe hundreds of thousands of commuters. But that wasn't the idea. They were taking it slow and soft, annoying the Brits to death instead.
The cost to the Brits in money, embarrassment and nerves was just getting out of hand. When Tony Blair was elected in early 1997, he went to Belfast and met with the PIRA leadership. A few months later, after months of schmoozing from Clinton, the PIRA declared a ceasefire.
In fact the 'next generation' that your talking about were English-raised, so they didn't have that giveaway Belfast accent. They were classic urban guerrilla material: disciplined, young guys who held day jobs and didn't talk. And they'd still be blasting bombs today if Blair and Clinton hadn't talked with em and came to an agreement.
