Having described the different types of revolutionists, Crane Brinton in The Anatomy of Revolution now looks at the rule of the moderates, and why it always seems to be doomed to failure.
At the outset of revolution, the moderates seem to be just the right people to take over; even in Russia in February 1917 when moderates, led by Prince Lvov, took power.
The problem is that the moderates are faced with an impossible task: keeping a government going, writing a new constitution, and usually confronted with a foreign war. And they are confronted with the extremists,
who insisted that the moderates were trying to stop the revolution, that they had betrayed it, that they were as bad as the rulers of the old regime -- indeed, much worse, since they were traitors as well as fools and scoundrels.
And the result is that the radicals end up taking power. Even in the American Revolution, it was the radicals that won, in the Declaration of Independence. There is something about the revolutionary process that leaves moderates in the dust.
In the English Revolution the revolutionaries, the Parliamentarians, were divided roughly into three: an Episcopalian group that were almost Royalists: a moderate group, "Presbyterian in religion, puritan in ethics," constitutional monarchists at heart; and extremists, the Independents, extreme Calvinists. They Indpendents made themselves effective through their control of the New Model Army. The Independents were the most ideological, and under Cromwell they won the revolution.
In the American Revolution there were Loyalists that really didn't have a problem with the royal government, the moderate merchants that started the agitation with their opposition to the Stamp Act, and the radicals with their committees of correspondence and committees of safety "exhibited extraordinary technical skill in the practical politics of revolution" and organized the Continental Congress. in 1774.
In the French Revolution the Royalists were dispatched almost immediately, Moderates like Mirabeau, Lafayette, and the Lameths were opposed by radicals Pétion, Robespierre, Danton, and Brissot. But then war broke out with Austria and Prussia, France was invaded and the radicals threw out the monarchy in an attack on the Tuileries Palace in August 1792. When it came to try the King, the moderates were divided, and so the radicals, "better organized, more aggressive, and perhaps more unscrupulous," won absolute power.
In the Russian Revolution the first government was supported mostly by Kadets, the left-wing of pre-revolutionary Russia. But it fell over the question of continuing the war to support the "imperialist" allies. It was followed by a Socialist government, accused by the Bolsheviks of being "compromisist," certainly moderate compared to the Bolsheviks. The Bolsheviks almost lost when they backed a "rising of workers in Petrograd" in July, but got their mojo back in the October Revolution when they "took over Petrograd with astonishingly little difficulty and almost no bloodshed."
Brinton explains the victory of the radicals according to a theory of "dual sovereignty," that a parallel illegal government was growing alongside the official, legal government, and eventually acquired enough power to stage a coup and take over. This occurred twice in the English Revolution where the legal government of King Charles was overthrown by the Long Parliament, and again, the Parliament was overthrown by the New Model Army. In the American Revolution this is obscured somewhat because men adhering to the illegal government often served in the legal town councils and colonial legislatures. In the French Revolution the radicals slowly increased their control of Jacobin Clubs. In the Russian Revolution the Bolsheviks slowly gained control of the various soviets -- literally "councils" -- set up after the 1905 rising that ended up constituting a rival government. The point is that in each revolution the extremists were able to construct a rival illegal government network that, at the critical moment could seize power from the legal government.
The weakness of the moderates derives mostly from the difficulty of suppressing the radicals without seeming to be the enemy of the revolution, a situation that all the radical groups exploited, up until the radicals seized power and declared and enforced an end to politics. In other words, if you want to win a revolution, then opposition politics ends on the day that you take power. If you are a moderate and believe in a fair and free discussion of the issues, this is impossible to bring off.