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Long answer
Pro-Palestine supporters often use genocidal rhetoric for Israel, with one famous example being “From the river to the sea Palestine will be free”. It is a common notion as well to overlook and deform historical facts for pro-Palestinian propaganda purposes. It is unclear how much of it stems from antisemitism, but it is fair to assume that it is the basis of much of the misinformation. Furthermore, it should also be noted that there were no protests in many other instances of Arab casualties in various wars, including the over 2,000 Palestinians killed in the Syrian civil war, or against the expulsion of over a million Afghan refugees from Pakistan back to Afghanistan and under the rule of the Taliban.