I agree with you but I would expand the notion. Not only all Israeli politicians are crooks but all politicians everywhere are crooks. An honest person could not advance in such a profession. As for Lieberman, don't waste your tears. He is arrogant and stupid and that is why he was caught.
Police disperse hundreds in brawl in Kafr Manda, northern Israel (Haaretz)
from the article: Lieberman to be served draft indictment for graft in next 24 hours