The best example of this would be the treatment of the people of Gaza. Israeli sources have estimated Hamas membership at between ten and fifty thousand in Gaza. Using the larger figure, that is only about four percent of the popukation. Most of the Gazans just try to live their lives in spite of the hardships placed upon them by Israel. During the Gaza op, Israel destroyed much of Gaza and killed hundreds of innocent civilians. Most nations, including America would move to help repair the damage they caused and try to reach out to their victims. Israel, on the other hand, treats all Gazans as "terrorists". Not only does Israel not help fix the problems they caused for the innocents, they take steps to make it worse. This single aspect, one of many, is enough to completely delegitimize Israel in the eyes of the world. It is not how a civilized nation acts, and certainly not one that styles itself a western style democracy.
Shaffir to Herzog: Opposition failed to show leadership in political battles against PM (Haaretz)
from the article: Comment / Israel delegitimizers threaten its existence