Be Careful What You Want

In 1917, the Russian peasants were demanding: "Land and Freedom!" But Lenin and Stalin is what they got.
In 1933, the Germans were demanding: "Room to live!" But what they got was Hitler.
In 1793, the French were shouting: "Liberty, Equality, Fraternity!" What they got was Napoleon.
In 1776, the Americans were proclaiming "The Rights of Man" -- and, led by political philosophers, they achieved it.

No revolution, no matter how justified, and no movement, no matter how popular, has ever succeeded without a political philosophy to guide it, to set its direction and goal.

Source: Capitalism: The Unknown Ideal (1966) by Ayn Rand.