Strategy Against ISIS

It's somewhat paradoxical to get worried about a handful of people (in the UK) making decisions to go off and fight and die on whatever side in today's distant parts; when 57,000 British soldiers died on the first day of the Somme with little idea why they were there at all. A little history goes a long way; shame on the government and the media in this ongoing propaganda of fear. Why not ask, on this media and in this government, WHY are these people moved to do this? What caused this conflict? Huh? Please come up with some decent answers.
I healthy start would be the free distribution to all of this cracking little volume (above) which begins in sanguine tone;

'How do wars begin? this is perhaps the most constant theme of the historian.Wars make up most of European history.In every civilisation there have been wars, at any rate until, we think, our own time. Wars are caused in all sorts of ways- wars of conquest, wars of imperial rivalries, wars of family disputes, religious wars.
In the eighteenth century they had settled down in to almost legalistic wars....'

Great man, AJP Taylor.