That the IDF has a system of checks and balances and faces enemies on several frontiers in no way affects the legitimacy of any actions it takes. Israel is still bound to adhere to the norms of international conduct. An unfortunate aspect of zionism is that many of its adherents believe Israel being a Jewish nation absolves it of the obligation to observe the law. Jews are subject to the same laws as anyone else, and are entitled to nothing more than Christians, Muslims, Buddhists, or people of any other religion. No less, no more.
Ya'alon okays administrative detention of Jewish extremist suspected in church arson (Haaretz)
from the article: Goldstone to attend grandson's bar mitzvah as Zionist groups end feud