Arabs had Oil but were not allowed control over it. Once they became conscious they started fighting. First they were exploited and now they are retaliating. It is the same throughout Man's history, and religion has nothing to do with it.
The methods chosen by a fighting people are always according to the circumstances. Do you think Poison Gas attacks among the world's most modern and fully educated Europeans (all of whom were Christians) during first World War were a Civilised method, less cruel than modern terrorist methods? The suicide bombs at least kill fast, rather than prolonged agonising death in poison gas attacks.
Truth is not possible to learn without honesty of observation. Let us take a scientific look at Islamic Terrorism from the view point of Cause and Effect rather than merely Moralise or criticise, if we want to understand and control this type of human behaviour.
We don't like it because we are at the receiving end of their actions. However an objective point of view would show that they are not wrong to fight for control over their affairs.