If you want to know who is most terrified by what is happening in Gaza, it's not the US, although this is bad news for Bush. It's not the Israelis, although this is bad news for them, too. It's not even Abu Mazen over in Ramallah. There is even a clever argument to be made that over time, this will weaken Hamas and eventually contribute to a painstaking peace, built on a West Bank first policy. I don't know if that's true, but it is the best outcome that can be hoped for.
But the pictures and stories of executions and security officers pushed off roofs are affecting people far beyond Israel-Palestine.
The people REALLY frightened are those in the security forces in Egypt, Jordan, Syria and other places where Muslim extremists have been brutally tortured and suppressed. This is what it would look like in Cairo if (when?) the rulling claque there started to fall.
I loath Hamas, and what it stands for. It has practiced terrorism with inhuman glee, and is committed to the destruction of Israel. But at the same time--Arafat's treatment of them during his reign was atrocious. His corrupt Fatah movement ripped off the people and tortured its opponents in the very prisons and buildings overrun yesterday.
Mubarak has been far worse to his Muslim opponents and far more corrupt even than Arafat, which is quite an accomplishment. (in his defense, there was more to steal)
What does all this mean? Well, it could mean that Egypt looks over the border into Gaza and sees the abyss to which it doesn't want to sink. And that could weaken Mubarak's opponents, and give a desperate power to Mubarak's supporters. Victory or death is quite a good rallying cry. But I don't think that's the likely outcome. I think it will embolden the Muslim Brotherhood of Egypt, and splinter the security forces that fight them. Come the revolution, no one in Egypt's feared security forces wants to individually be high on the list of torturers and suppressers.