Whenever order breaks down, even in a “good” cause, its likely more will be broken than one expects.
This sort of thing is rarely clean.
When we were protesting Marcos in the Philippines, in the 80’s, we were terrified of exactly this, and we worked hard to create order and discipline. It worked, just.
An interesting side element of these moments of social breakdown in history—be it the French Revolution, the Russian Revolution, the fairly-bloodless “Carnation Revolution” of Portugal in 1974, or the more recent mess in Yugoslavia—is that of people taking advantage of the general unrest to settle old scores.
It wouldn’t surprise me if some—perhaps even most?—of the totally-unrelated-to-fuel-taxes destruction of businesses and homes we’re seeing in Paris is exactly that.