Gladly most muslims selectively do not follow the parts of the Quran which advocate violence, but it is definitely in there. Islamic extremists are basically literal interpreters of certain parts of the book, mostly those written by Muhammad himself, who was a warrior/aristocrat LARP'ing as a spiritual guru.
https://en.wikipedia.org/wiki/Muhammad
"Subsequent to obtaining a divine instruction to battle the polytheists, Muhammad dispatched his followers to perform raids on the Quraysh's trading caravans. Certain Meccan followers of his were reluctant to partake, as it would mean attacking their own tribespeople. This vexed Muhammad, resulting in the revelation of Quran verse 2:216, among others, which asserts that fighting is good and has been made obligatory for them. After several months of failures, Muhammad managed to achieve his first successful raid, at Nakhla, during a month that the pagans forbade themselves from shedding blood. When the bountiful plunder was being brought back to him in Medina, Muhammad was met with censure from the locals. He contended that his followers had misconstrued his command, and he postponed taking his one-fifth portion of the spoil until a verse was ultimately revealed, legitimizing the attack.
In the early stages of his time in Medina, Muhammad was optimistic that the Jewish people would acknowledge him as a Prophet and strove to obtain converts from their community. However, his efforts were unsuccessful and even faced ridicule, as the Jews perceived inconsistencies between the Quran and their own scriptures. Consequently, the Quran accused the Jews of hiding and modifying parts of their holy texts. The Jewish criticism and refusal presented a danger to his prophetic claims, and, as a result, the views of Muhammad and the Quran towards them worsened. This then led to the reorientation of the Muslim prayer direction, the qibla, from Jerusalem to the Kaaba. Following the Battle of Badr, Muhammad revealed his intention to expel the Jews from the land. Once the ransom arrangements for the Meccan captives were finalized, he initiated a siege on the Banu Qaynuqa, regarded as the weakest and wealthiest of Medina's three main Jewish tribes."
These terrorists wouldn't hesitate to slit your throat if you didn't pledge allegiance to Muhammad, and even if you did they'd probably still murder you. And that's why they all need to be sent promptly back to Allah to check in, permanently. It's really sad that some of their normal/moderate compatriots will be joining them, but unfortunately, that's their whole plan. Use the palestinian people as a gigantic group of hostages which they can slowly sacrifice on their altar to Muhammed. And don't make the mistake of turning this into a class war about "oppressed people". Muhammed filled palaces with treasure he stole from the people he murdered.
you will own nothing!