Andher knows it.The most important aspect is the Suez canal not only for the US but for all Western countries who need to navigate their ships cargo. Obama knows it,and HE should not try to meddle too much in the country that is going through a revolution. There is a balance of measures to be considered,so the US has to tread gently,without threatening what is already a very dicey.
Woman moderately wounded by firebomb thrown at her car in north J'lem (Haaretz)
from the article: Egypt opposition refuses to negotiate, even as violence spirals