Why aren’t we asking what proportion of Syrians back the uprising?

What proportion of the Syrian population is fully in support of the continued uprising against the country’s authoritarian leader, Bashar al-Assad? It is not a question I have heard addressed often — not by our journalists bravely reporting from beneath the Syrian army’s mortar attacks, nor indeed by those sitting at home writing for outraged liberal broadsheets, demanding we arm the rebels, or at least do something.