Perhaps they should throw rocks – big ones, ones that can cause real damage. The Arabs tend to prefer things that go “boom” – which is what the zionists used when they wanted to protest (note – they didn’t throw diapers at the King David Hotel).
Perhaps it might be better to have totally orderly, peaceful civil disobedience. Such were used by African Americans in the United States and worked out well (albeit the vast majority of states had already banned racial discrimination and regarded the southerns as jerks for their racial policies). Also the American legal system
was open to civil rights suits, whereas the Israeli legal system is controlled by a self-perpetuating system that reflects the viciously anti-religious elites who dominated Israel in the 1950s.
Given that in that part of the world, protests tend to involve a lot more than tossing diapers, we shouldn’t complain. The real issue is that the rulers of Eretz Yisrael want to surpress Torah Judaism no less than the “Hellenists” did, but that the Hareidim don’t want to rely on a miracle and take up armed resistance (you can find a full halachic discussion of why not in the original Satmarer’s seferim).