As I recall from a conversation I had with a muslim friend of mine who went to the Islamic version of a seminary school, the term "Jihad" appears in the Koran only 6 times, mostly in terms of the internal struggle you must wage within your own heart to do what is right instead of what you want. I believe there is only one reference to Jihad as an external war against other people, and it is quite specific in that such a Holy War can only be in defence of a direct attack - offensive war is not allowed. There are very strict rules of conduct, similar to the Chivalry Codes of Conduct, but probably even more strict, concerning the treatment of non-combatants.
Unfortunately, certain leaders use the simplified idea of Jihad to include any conflict where there are predominantly muslims on one side and other peoples on the other, in order to garner more power for themselves.
But everyone should know that the "Islam" that is followed by the Taliban and other extremists has absolutely nothing to do with the beautiful faith that is actually proposed by the Koran.
The only thing you should feel when shooting a terrorist: Recoil.