Yes it does. Shiites and Americans share a common goal of seeing a stable democracy established in Iraq. Will they ally with America forever? Probably not. But against Al Qaeda and the insurgents? Absolutely. Moreover, even if the Shiites were diametrically opposed to mere the existence of the United States -- which they're not -- the idea of rooting for the tragic deaths of 841+ civilians -- men, women and children -- is morally reprehensible.
That's a staggering number, what's worse is the ease of this tactic. Yell suicide bomber and let fear and panic kill 800 people, I guess fear really is the true enemy.