It is the dictatorship of Mubarak that caused all the instability in Egypt now. Ironically, while Israel is trying to save a falling regimen in Egypt, the last thing such a regimen will need now is to be shown as dependant in its survival on the efforts of Israel. By doing this, Israel widen the gap and mistrust between the regimen and Egyptians aggrevating the instability.
UN: Gaza could be 'uninhabitable' by 2020 if trends continue (AP)
from the article: Israel urges world to curb criticism of Egypt's Mubarak