the US security state funded a bunch of anarchists in the 1960s because they aren't a threat to state power and were an effective way to split the left against MLs
Anyway, the basic point is that socialist revolution is neither easy (as the Trotskyists and ultraleftists would have it) nor impossible (as the liberals and conservatives would have it), but hard. It will require dedication and sacrifice and it won’t be won in a day. Tankies are those people who think the millions of communists who fought and died for socialism in the twentieth century weren’t evil, dupes, or wasting their time, but people to whom we owe a great deal and who can still teach us a lot.
Or, to put it another way: socialism has powerful enemies. Those enemies don’t care how you feel about Marx or Makhno or Deleuze or communism in the abstract, they care about your feelings towards FARC, the Naxals, Cuba, DPRK, etc. They care about your position with respect to states and contenders-for-statehood, and how likely you are to try and emulate them. They are not worried about the molecular and the rhizomatic because they know that those things can be brought back into line by the application of force. It’s their monopoly on force that they are primarily concerned to protect. When you desert real socialism in favor of ideal socialism, the kind that never took up arms against anybody, you’re doing them a favor.