Another factor must be taken into account. Discussion on terrorism, as on any other contentious issue, will be unconvincing if a taboo is placed on looking at root causes. During the Cold War, when all western arsenal was focused on the Soviet Union, were there recorded instances of Islamic terrorism? It would be instructive to list them if, indeed, there were any.
Yes, about the time Israel was in its birth throes there were terrorist outfits like Irgun and Haganah. I have seen Palestinian groups linked to George Habash and Yasser Arafat, bomb Northern Galilee with mortar shells from villages like Hebbariye, where one drove via Syria. But that was at the cusp of what was called decolonization everywhere. Wars of national liberation had support from Progressive states.