It is a fact, though, that the recuring riots in the free countries follow the same pattern - the hopelessness of poverty and discrimination, oppression and racism by authorities including but not limited to the police create an atmosphere of hatred which, sparked by an incident - a beating, a shooting - and days of rioting with the destruction of property in general, but in particular, symbols of authority and state power.
When this happens in London, Los Angeles, Paris - it is condemned. When it happens in Tunis, Cairo, Bahrain - it is Arab Spring and the bud of democracy. They are not to be compared.
The fact is though, that they are of the same sort - albeit far apart on a scale - the mechanism is the same, an atmosphere of hatred, sparked by some incident, explodes.