I suggest you type in "rocks" and see how many articles you find that are about "Pals". Also I kind of wonder how blind you have to be to miss that this very article rocks are used more times than stones to describe projectiles thrown by Palestinians. In fact "stone" is only used one time, in the word "stone-throwers", and I think that term is a little bit more common than "rock-throwers" or whatever you would have preferred instead.
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Gaza education ministry shuts 2 Shejaiyeh schools citing fear of Israeli artillery fire (Haaretz)
from the article: Jewish rock-throwers are more equal