Two things about the riot video below struck me. The first is the presence of the Egypt Museum in the background. The museum, which is probably my favorite on earth, is the repository of a great civilization. And look what happens on the streets around it.
The second is the total absence of any police or security. These are scenes of total anarchy. One main worry about the future of Egypt is that every day of continued instability means another day when the economy can't lift itself out of its hole.