Jihadis need not be "recruited." They can "recruit" themselves. Mohammad "Mike" Hawash was an Intel engineer, very successful, earning $360,000 a year. He had married an American, had three children, appeared completely "integrated." Then he began to get religion, that old-time religion, grew a beard, read and re-read the Qur'an. Why he did this isn't clear, but he might have done it for any or all of the reasons that people everywhere start to get religion or take up a Cause. Except that in the case of "Mike" Hawash, the Cause was Islam.
After the attacks of 9/11/2001, "Mike" Hawash was furious. He was not furious at the attackers. He was furious at the American government. With others, he made plans to go to Western China, and then from there to Afghanistan, to fight, not Al Qaeda, not the Taliban that supported and was supported by, Al Qaeda, but American troops -- his "fellow" Americans.
There are others like that -- in Great Britain, in France, in Germany , in India, dappertutto -- who have been picked up, or are being tracked or have neither been picked up nor are being tracked. To their number will inevitably be added many more, especially as Infidel governments seem intent on "integrating" Muslims by making sure they have every possible opportunity to acquire vocational training (education is a different thing) in computer technology, in chemical engineering, in biology, even in nuclear technology. And those are the favorite fields for Muslims -- for some reason the history of art, the history of anything other than Islam or subjects directly impinging on Islam, literature (unless it is the literature of Muslim peoples or the history of how, in other literatures, Muslims are so cruelly "depicted") , and even pure science is simply out - no investigation of DNA, or how humans think, no attempt around and about a unified field theory -- none of that seems to appeal. But that chemical engineering, that computer technology -- that's the stuff.
There will be many more such cases, as the push to "integrate" Muslims in Infidel lands provides them with every opportunity to acquire more -- not education, of course, but the knowledge, the means, if they choose, to do greater damage than they would, or could, had they been not encouraged but prevented from receiving such training.