Its the same shaila as voting for israeli elections
We dont hold of the medina and not of the WZO, but Gedoilei Yisroel paskened to vote in order to save klal yisroel from the gezeirois of the medina, so to with the WZO if we dont vote the amounts of money going to the reform and liberal organizations is a real Gezeira,
as I heard from R Avrohom Gurwicz Shlita that the purpose of voting for the WZO is that the money should not reach them and be’etzem we can bury the money, but we might as well use it..