There’s nothing worse for a revolutionary than victory.
Consider the plight of the Russian communist revolutionaries. So long as the czarist loyalist remained, the handful of communist factions had a common enemy upon which to focus.
Then the communists won. Without the common foe to unite them, they quickly turned on one another (sorry Mensheviks and anarchists, there’s only room in Moscow for one communist party).
Then the Bolsheviks won. Without external communist foes to unite them, they too turned on one another (GTFO, Trotsky, and take Bukharin and Zinoviev with you).
Then the remaining Bolsheviks realized that without an external enemy, they would have to continue killing each other. So the people were accused of being kulaks and counter-revolutionaries.
The counter-revolutionary is the last refuge of a revolutionary that has run out of foes to kill. It is likely that without the counter-revolutionary, the revolutionary would have to kill himself.