Because an organized state will always overpower it. And history is a story of power.
I always say, show me the theory that allows anarchists to maintain a complex network of nuclear armament. You can't "anarchically control" the nukes.
People just never really come to grips with the era we actually live in. We live in an era where a spaceship could throw an asteroid at the earth, or where a guy in a garage with an axe to grind could release an extinction level bioweapon, or where a computer program made by a skilled hacker could decimate power grids and kill millions. We are terraforming the earth. We are in a society that is much closer to godhood than to primitive man.
No war ever fought was fought for or benefited the working class. It was always to benefit someone else. Even when the socialists did it, they did it as a vanguard party, and that vanguard ultimately did it to benefit themselves. Sometimes they have the ancillary benefit of redeeming some horror in our past, like slavery, but people are naive if they think the north went to war with the south to eliminate slavery, or that the Americans won against the British without French help, who mostly had victory against the British on their mind, not American independence.
Instead, society changes when material conditions change. It rarely changes through ideologically motivated struggle. It changes overnight because someone invented the lightbulb, discovered a new continent, or a new farming technique, etc. Entire empires have fallen practically overnight because of the switch from peasantry to steam powered industry. Nothing can prevent it, and barely a drop of blood need be spilt, because it's inevitable.
Trump CANT stop green energy development, because now it's cheaper than coal. That's a material condition change. That's the best kind of resistance you can do.