There had been a bad spell of weather, and the Yo-Yo was new, so it seems to have been the scapegoat. The theory was that something about its motion was influencing the weather pattern.
Try the following book for more details: Syria and the French Mandate: The Politics of Arab Nationalism, 1920-1945, by Philip S Khoury. Princeton, NJ: Princeton University Press; London: Tauris, 1987