This is looking at the situation from the worst case scenario, without even taking into consideration how many are saying preemptive war would actually make things worse for Israel, as I’ve shown in previous posts.
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From: thepublicdiscourse.com

Just War and the Iran Crisis

by March 7, 2012

It would be wrong for the United States to engage at this time in an attack on Iran or to participate substantially in an Israeli action.

Before launching an attack on Iran’s nuclear facilities, we must pause to reflect on whether such military action is morally justifiable. As heirs of the West, we Americans have the privilege of drawing upon a tradition of moral reflection on war that is at least 2000 years old. The greatest philosophers and theologians of our history have contributed to the “just war” theory, including Cicero, Ambrose, Augustine, Thomas Aquinas, Vitoria, and Suarez, and this tradition has been embraced by a broad consensus of theologians and moral theorists from many religious and secular backgrounds. Just war theory embodies two principal ideas: the sacredness of human life, and the impermissibility of “doing evil that good may come” (as St. Paul put it in Romans chapter 3).

For the sake of argument, I will assume in this essay the worst possible case….

Entire Article Here
Related:
Sean Stone (Oliver Stone’s son): Should the United States Bomb Iran? Sean Stone returns from Iran — ATTACKING IRAN COULD MAKE THINGS WORSE for ISRAEL!
[Video] 60 Minutes: Meir Dagan, former Israeli CHIEF of MOSSAD tells Lesley Stahl that an AIRSTRIKE anytime soon AGAINST IRAN is premature and COULD LEAD TO *DISASTER*!
Greg Boyd: In the kingdom of God, we are not allowed to have any enemies. All body-bags are equally tragic.