The fact that these people speak Arabic in various dialects with varying degrees of mutual intelligibility does not make them a single entity. No unifying consciousness binds them together - not language, not national borders, not shared history and not even religion. They don't feel a connection to one another. The phrase "Arab world" is a complete misnomer. Syrian Alawis feel a stronger connection to "non-Arab" (i.e., people who don't speak Arabic, because Syrians aren't Arabs) Persians, while Syrian Sunnis seem to have an affinity for "non-Arab" Turks.

Hell, Libya only has a population of about 6 million people and they are currently split into about 10 different factions based on ethnic, religious and regional lines.

The only reason the countries held together in their national borders was that they were governed by ruthless dictators who maintained control with an iron fist over their domains. When the dictators fall, the result is the same as when the Soviet empire fell. The fake country collapses and the only real allegiances that exist come to the forefront.

The language of all these peoples is called Arabic, but we know that even there it isn't unified. Their cultures are a mix of indigenous ideas particular to their regions, culture from previous Arabic and non-Arabic empires and modern developments. It's like trying to say that "Europe" is a cultural monolith because of Christianity.