Thane Rosenbaum, in the Wall Street Journal, begins coming to his senses.

Many Jews are in my position — the children and grandchildren of labor leaders, socialists, pacifists, humanitarians, antiwar protestors — instinctively leaning left, rejecting war, unwilling to demonize, and insisting that violence only breeds more violence. Most of all we share the profound belief that killing, humiliation and the infliction of unnecessary pain are not Jewish attributes.

However, the world as we know it today — post-Holocaust, post-9/11, post-sanity — is not cooperating. Given the realities of the new Middle East, perhaps it is time for a reality check. For this reason, many Jewish liberals are surrendering to the mindset that there are no solutions other than to allow Israel to defend itself — with whatever means necessary. Unfortunately, the inevitability of Israel coincides with the inevitability of anti-Semitism.

This is what more politically conservative Jews and hardcore Zionists maintained from the outset. And it was this nightmare that the Jewish left always refused to imagine. So we lay awake at night, afraid to sleep. Surely the Arabs were tired, too. Surely they would want to improve their societies and educate their children rather than strap bombs on to them.

If the Palestinians didn’t want that for themselves, if building a nation was not their priority, then peace in exchange for territories was nothing but a pipe dream. It was all wish-fulfillment, morally and practically necessary, yet ultimately motivated by a weary Israeli society — the harsh reality of Arab animus, the spiritual toll that the occupation had taken on a Jewish state battered by negative world opinion.

The Jewish left is now in shambles. Peace Now advocates have lost their momentum, and, in some sense, their moral clarity. Opinion polls in Israel are showing near unanimous support for stronger incursions into Lebanon. And until kidnapped soldiers are returned and acts of terror curtailed, any further conversations about the future of the West Bank have been set aside.

Not unlike the deep divisions between the values of red- and blue-state America, world Jewry is being forced to reconsider all of its underlying assumptions about peace in the Middle East. The recent disastrous events in Lebanon and Gaza have inadvertently created a newly united Jewish consciousness — bringing right and left together into one deeply cynical red state.