When people do extreme things it's for a cause. The cause is generally related to a bad guy doing something bad, whether it's Israel trying to clear out Palestinians from Palestine so they have the country themselves, through to the evil Obama trying to force his liberal values on healthcare on innocent american companies.
What religion does is allow people to justify their actions. Someone annoying you isn't grounds for killing them, or a supreme court challenge. Someone being morally evil can be, on religious grounds. So religion is invoked to justify precisely what wouldn't be easy to justify ordinarily, whether it's killing oneself, or denying employees healthcare. It helps moral justification of action.
This is a view built largely on Western secular morality. In the West, people derive their morals secularly; they do not decide what is right or wrong based on what is in a book—
any book—but based on their own judgement of decency, fairness, equality, humility, and humanity. We may find plenty of people, especially in the U.S., who argue that their morality comes from God, from reading the Bible. But when we ask them the typical questions asked of such people ("If God told you to rape children, would you start raping children?"), their inability to provide a resounding "yes" response—and instead weaving around various excuses to dismiss the issue—betrays the fact that their morality is
secular; it is not
religious.
That any of their morals have correlates in religious texts is coincidental: they established their morality first, and found the religious morals that agreed with it. And this attitude toward morality is the basis of statements such as those you make: "What religion does is allow people to justify their actions." This is true of a world built on secular morality; but this is not true of a world built on religious morality.
Your opinions are completely colored by the mindset of secular morality, and so you simply cannot comprehend a world, a society, a culture, in which people sincerely and truthfully (not only through lip service) derive their morality from religious authorities. I cannot comprehend it either. I can learn about it, and perhaps understand it. But I can never really feel it and empathize with such derivations of morality; my belief in secular morality is so deep that it cannot be shaken.
Suicide bombers aren't blindly killing people they would ordinarily like - there are still perfectly understandable motives for the attack and for the target.
That you hold such a sentiment is frightening. I cannot understand anything in the motives of a suicide bomber. It is incomprehensible to me; the thought of killing other people because they are different. There is never an understandable motive for murder.
Sectarian violence is a world-wide thing, from the US experience with the Black Panthers and the KKK, to The violence in Northern Ireland between protestants and catholics, to the conflicts between tribes in Africa. These are conflicts about whether a community can resist outside influences from alien cultures, and the poorer you are, the more of a survival lifeline your community is.
Things like the KKK and Black Panthers do not compare to the violence of Islam or African tribal conflicts. Again, you are clouded by your Western mindset that conflict is rooted in some understandable aspect of the human condition. But this is not true. It cannot be true. Conflict has real causes, and we can eliminate those causes. To believe the contrary, that some people are just bad and we will always have to suffer them, is to give up hope for peace.
I believe peace a worthy-enough goal to not give up hope for it.
'Islam' is too vague. Most Muslims aren't involved in sectarian violence any more than most Christians are or most practicing Jews are.
Again, you need to understand that Islam is a moral system; the people who practice Islam derive their morality from their religious authorities. And every one of those religious authorities (Koran, hadith, etc.) preach the same thing. There is no vagueness about it.
Jon