I knew it would happen that most here wouldn't understand what I'm trying to say, and so I was reluctant to post my thoughts, but I did anyway.
Clearly what these 'Islamic' terrorists are doing is wrong. They're no better than any other terrorist. It's appalling and revolting and wrong. They absolutely should be punished.
I'll finish off with an analogy that may help express the ideas behind my earlier posts better.
Some internal diseases can start, and grow, and grow while we are completely unaware. We feel no pain, we see no symptoms. Eventually once the disease has past a threshold, small legions start to appear on our skin. The real catastrophe is happening in our internal organ(s), but all we see are these small but irritating and nasty things on our skin. We often won't go to the doctor because either we think it's not such a big problem and it will eventually go away, or because we are too afraid of what might be under the surface.
In this analogy, the legions are the terrorists and their terrorism, and the internal disease is the grievances built up over several generations. It's a very poor analogy in every way except one. It may help us to understand that the reasons for this terrorism we experiencing in recent times goes far deeper than the skin, and has been brewing for longer than we might think.