Y do they do this
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This is terrorism.
Most people will say that they are mentally ill, but that's actually not the case. People like Osama bin Laden were masterminds. Marc Sageman of the Foreign Policy Research Institute compiled background data of about 400 Al Qaeda members and discovered that three-quarters belonged to the middle or upper class compromised of educated individuals like engineers, architects, civil engineers and scientists.
Repressive government plays a huge part in it. They deride the dissent minorities and thus attract their overwhelming opposition in the form of retaliation and rebellion.
Such people are not mentally ill but they are rather "brainwashed" by radical ideas. The fear of pain, hurting others, circumstances and righteousness, everything is vanished by the authority controlling them on the name of god. They are promised emancipation and life in heaven by the evil peers by saying that god loves sacrifice.
They are fed up that our brothers are being punished and prejudiced by the people of other race/caste/religion and they should teach the martyr a lesson. So, they never hesitate in suicide bombing.
Yes, poverty and lack of education play a part but it's not the only case. Officials, inside job, insanity (of course), religion, class, authority, property etc. Play a major role too.0