I feel as if it was a necessary in the building blocks in american history. Without the constitutional convection who knows how we would be governed.
the answer is Simon de Montfort
It murdered thousands of innocent people, turned into an illiberal mess of collectivist radicalism disguised as enlightenment, produced a military dictatorship, ended with complete and total military failure, and resulted in the Bourbon Monarchy being restored.
I think it is because they wanted to find a bird worthy of power