Not that I support these radicals, but the logic they use to rule suicide bombing as permitted is rooted in the Islamic principle that neccessity overrides prohibition.
In this case, the logic used is that suicide is definately haraam, and ordinarily strapping explosive to yourself and letting them off would be a grave sin. But if in a jihad, you lack effective weapons to fight, and suicide bombings are the most effective means at hand, then they are no longer haraam.
These rulings were rooted in the Israeli-Palestine conflict. Israel had planes and helicopters and tanks that could make targetted attacks anywhere in the Palestians lands and cities, and the Palestinians had none of these. The only effective explosive delivery mechanism they had was the human body. Back then, scholars ruled that this neccessity meant suicide bombing was ok.
Today, we are seeing so-called "jihads" being waged even against Muslim societies such as Pakistan, Afghanistan and Iraq, but the same logic of fatwas has been applied.
As I mentioned before, the only solution is to get to Maulvis and imams propounding extremist views, and get them to renounce those views or kill them.
Frankly, this is how the Ottoman Khalifat deal with extremists such as those from Arabia who raided Shia shrines in Ottoman-controlled Iraq. This is the model that just be applied today.
Brother, I know the background of suicide bombing. Anyhow, whatever the background, there is no doubt that all sorts of suicide are haram act. Whoever believes on any type of suicide as Allowed in Islam does not believe on Allah, so that person is not Muslim. There are logical reasons for suicide being haram.
For instance: Let say 'A' believes that whatever happening is in the hand of Allah and he as individual is not running the world but doing his duty and going through test by Allah whereas the world around him is his testing ground. For him, this world situation should not matter as he would recognise that he himself is going through the test (similar to anyone else around him, be they Muslim or non-Muslim). For him, he would try his best according to his ability, but would not go beyond a limit in trying for that, as Allah has put a limit in front of him. This person would not break rules of Allah. Obviously, such person would believe that his actions are part of test, and though he is responsible of his actions, any change that happens because of his actions was not actually due to his actions but due to will of Allah.
If Palestinians are going to get independence than they can try their best and hardest, but independence would come when Allah would will so (that is Iman of a Muslim). So, a person struggling would try his best, but would never do suicide to get that change, as change does not depend on his actions but will of Allah. Suicide also knocks a person out of test and shows that the person has no belief on Allah or on the will of Allah, but tried to change things with his haram actions believing that his haram actions may give result, not accepting that result is not dependent on his actions but on the will of Allah (mean ... the person have no Iman on Allah and his will ... and if did suicide, he would die as unbeliever).
Same is true of suicide due to economical reasons, failure in life, failure in love or failure in business. If a person believes that Allah is in control of all good and bad, than that person would accept all successes and failures as test from Allah, and would never do suicide to get out of the situation.
My simple question for those who might have any doubt that suicide could be allowed is that ... what a Muslim should believe? Is it suicide that can give result or will of Allah?
From what I know: If anyone believes that result depends on suicide bombing than it shows that the person does not believe on Allah. As for those who believe that result comes because of will of Allah than such person would do every struggle (accepting that struggle as test) but would never do suicide to bring changes.