Excuse me, but if one simply reads the latest column by Gideon Levy, any sane mind can draw the score: Israeli politicians are for 98,9% zionists that are not interested in peace but prefer ethnical cleansing in order to establish a 'Arabrein' homeland for Jews. That's the core principle of Israeli politics: to establish a greater Israel on Palestinian land and to do it by deadly force and repressive occupation. So when you ask for serious opposition in Israel: do not seek as you already have it and its called Hamas and Iran. Accept the fact that Israel is being runned by religious fanatics that cannot be brought to Western-style senses.
Thousands protest outlawing of Islamic Movement in Umm al-Fahm in northern Israel (Haaretz)
from the article: Israel lacks an opposition to stop escalation of violence