The exact same argument can be made against unfettered capitalism.When you just read it and contenplate it, it sounds great. When it gets practiced it is a disaster.
No one has ever practiced actual communism, the Paris Commune attempted it, but feared seizing the French treasury, as it would appear the the world, that the communist were just after the money.
They leave the treasury, the regular army takes control, buys weapons, and finances their way back into power.
Because the Commune was able to meet on fewer than sixty days in all, only a few decrees were actually implemented. These included:
the separation of church and state;
the remission of rents owed for the entire period of the siege (during which, payment had been suspended);
the abolition of night work in the hundreds of Paris bakeries;
the granting of pensions to the unmarried companions and children of National Guards killed on active service;
the free return, by the city pawnshops, of all workmen's tools and household items valued up to 20 francs, pledged during the siege; the Commune was concerned that skilled workers had been forced to pawn their tools during the war;
the postponement of commercial debt obligations, and the abolition of interest on the debts; and
the right of employees to take over and run an enterprise if it were deserted by its owner; the Commune, nonetheless, recognized the previous owner's right to compensation.
Their process was much better than Pol Pot's... but point being, there is more than one way to skin a cat.
The Russian Revolution happened in Feb 1917, the communist didnt take control until October (and many werent communist, they were thugs veiled in a socialist flag).