They are 100% true Muslims. Their scripture tells them to kill all kafirs. It says even if some Muslims die during such attacks, it is OK and they will be highly rewarded after death.
Point to be noted is that Indian Muslims are not bad people. Their religion is bad. In fact most of them are most humane because while following the Islamic tradition is all prayers etc, they turn blind eye to the part of the stricture that tells them to kill Kafirs. In fact, most of them go to the extent of even denying the existence of such strictures.
One more thing: people in this forum act as if this is Hindus vs Muslim problem. Don't be blind, all over the world, these '100% true Muslims' who follow everything written in their holy book are creating problems. Thailand, Myanmar, European countries, Russia, US - name any country where they can form a group, they have created trouble. But they try to give these troubles a local picture so that their opposition stays divided. Bush's plan and action would have been best if it was really guided by restraining Global terrorism - Alas, US intention is oil and oil only. That is the tragedy.