One reason for Israel's repetitive violence is that if they admit it is a tactical failure and desist, they might have to negotiate a genuine peace treaty with the Palestinians. Many will immediately say that they have, repeatedly, tried to negotiate while always coming up against Palestinian intransigence. However, if one takes a close and objective look at these efforts at negotiation, one finds that they are facades or false fronts behind which we find Israeli intransigence.
As the liberal Zionist M. J. Rosenberg has pointed out, the Israelis have never negotiated in good faith. When the Palestinians react to Israel's bad faith, the Israelis break off negotiations and blame the Palestinians. Israel then returns to its pattern of repetitive violence. In truth, negotiating in good faith means compromising Israel's ambition to settle all of the land of Palestine, and that is something the hard-core Zionists will not do. As a consequence, it is not the Israelis, but the Palestinians who have lacked a partner who will negotiate responsibly.
Another reason is that once Israel has raised several generations of citizens to believe that the Palestinians are implacable enemies who "only understand force," it becomes politically difficult to change the message despite its elemental falseness. The myth of the impossibility of negotiating with the Palestinians is believed by so many Israelis that if a politician started advocating a genuine compromise, he or she would be marginalized or worse. Remember the fate of Yitzhak Rabin, who almost certainly was not operating in wholehearted good faith toward the Palestinians, but was assassinated anyway because of the fear that he was moving in that direction.
Finally, there is the connection the Israelis make between giving up their violence and appearing weak. Yet given their overwhelming superiority in weaponry and the fact that its repeated use has destroyed Palestinian society without stopping Palestinian attacks, why be concerned that switching to non-violent tactics, such as good faith negotiating, would signal weakness? My guess is that the Israelis aren't really afraid that the Palestinians would interpret things this way. They are concerned that they themselves would feel that they would be replicating the alleged passivity of European Jews in the face of the Nazi onslaught.
Part III -- The Fear of Showing Weakness
In other words, the Israeli fear of showing weakness is not an attitude that references outside groups. It references only the Israeli concern for their own self-image. It is the fear of seeing themselves as akin to European Jews passively going to the gas chambers that stands as the greatest psychological barrier to an Israeli decision to halt their repetitive violence. As noted above, this is so despite the fact that their interpretation of European Jewish behavior is historically misleading.
For hundreds of years Europe's Jews faced discrimination and persecution that periodically turned violent. These episodes of violence, known as pogroms, were murderous but short-lived. The Jewish communities learned that if they kept their heads down and allowed the storm to wash over them, their casualties were less. They learned this not just by being passive, but by comparing such behavior with the consequences of active resistance.
When in the twentieth century Nazi anti-Semitism emerged, most of the Jewish leadership interpreted it as yet another episode of pogroms, and they reacted to it in the manner that history had taught them would result in the least harm. Of course, they were wrong. The Nazis were a qualitatively different sort of enemy. But the Jews of Europe only discovered this when it was too late. Still, there were plenty of episodes of active Jewish resistance ranging from concentration camp revolts to the battle of the Warsaw ghetto. Unfortunately the Israelis and most other Zionists forget about this history and condemn Europe's Jews for being shamefully passive in the face of mortal danger. Thus was born the slogan "never again." This state of mind also encouraged the Zionists to see the Palestinians, and indeed all Arabs, as latter-day Nazis to be repeatedly vanquished with repetitive violence.
The Israelis would expel or kill a majority of the Palestinians left in their homeland if the world let them (and maybe over time it will). They would do so not only because it would clear the way for Jewish settlement of all of Palestine, but also because it would allow them to feel psychologically redeemed -- redeemed from the allegedly sinful passivity displayed by the victims of the Holocaust.
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