In terms of global security, there is no difference between Israel having a nuke and Iran having a nuke: if both countries have nukes, both would use them if attacked with nukes by the other. So what difference is there between Iran nuking Israel first or Israel nuking Iran first? Americans wouldn't even know the truth if Israel nuked first, since the Neocon lobby's media control would force US media to show Iran as the aggressor. Since Israel already has nukes, the key fact for global security is to stop the Isarelis and the Iranians from getting long-range delivery systems. As long as both actors can't reach outside the middle east, the rest of us should be safe. Actually, US should give Iran nukes and coerce one or both actors into striking: the world would be safer if this problem were resolved before either actor gets delivery systems; the sooner both sides exterminate each other the better for us.