Iran is hell bent on provoking us....why?
Return of the 12th Immam.
Read about it here:
http://www.iranian.ws/iran_news/publish/article_10945.shtml
Iran had no idea that the Israelis would respond so decisively, and that their mass-murder recruits would have so little fight in them. They've been talked up, but the only reason they didn't all die in the first two days is that Israel didn't want more collateral damage, because, y'know, Israelis are human beings (unlike the Hizzies).
Iran is on the to-do list anyway, but getting rid of their proxy in Lebanon will de-fang 'em a bit, frustrate the leadership, undermine the mullahcracy some more in the eyes of the Iranian public, and bring about a regmie change a little faster than otherwise possible.