A socialist society widens democracy to accommodate for this.

The following is from a Marxist Leninist perspective - other socialist tendencies are available:

For MLs we want to maintain state power in order to defend against hostile capitalist states and internal counter revolutionaries. Lenin describes this as a state, but not a state. He views the state as smashed as power transfers from the bourgeois to the proletariat.

The class enemy being put down, state power no longer is used to oppress the proletariat. The democractic process can be used after this point to deal with the remaining/new contridictions that exist/arise.

The reason why liberal democracy cannot provide the same thing for the proletariat is because liberal democracy is designed for and controled by the bourgeois to enact their oppression upon the proletariat.

The revolution isn't a singular event, but its also not a succession of violent conflicts. The class enemy being eradicated means true democratic process can exist