Fact 1: Bush did not rule out a strike altogether - he simply told Israel to stand by for time being. Fact 2: Iran has no strike back capability that would inflict casualties on a mass scale (some xx,xxx number), taking into account Israel missile defense and facilities for civilian protection. I would appreciate if you would disclosed the sources of your assessment.
Gunmen in Egypt kill guard outside Niger embassy (Reuters)
from the article: Israel attack wouldn't stop Iran nuclear program, says U.K. study