The argument that it's useless to abolish government ("The State") because someone will just come along and establish another one is very weak. And irrelevant.
Someday you are going to die. Does this mean there's no point in defending yourself from some evil loser who wants to murder you? Does this mean it would be pointless for me to step in to save you if you were hanging to the edge of a cliff?
Illness and pain are a fact of life. Does this mean you should never bother taking a painkiller or trying to medicate your way back to health? Maybe you shouldn't even bother trying to avoid getting sick or needlessly injuring yourself.
Government is death and illness in a (largely) self-imposed form. You don't need it. It's holding you back and making you weak.
Sure, some moron would probably try to set up another government if there were none. So? It's still better to kill off the superstition now and then deal with any remission later.