Why did Marx's Idea of the State 'Withering Away' prove Unsatisfactory?

-The Opposite had instead Happened: Very Authoritarian States had Replaced Capitalism with a Collectivised Economy led to the Oppression of the Media, Oppositionist Groups and Rights -To Protect the Revolution, Governments had to be Disciplined and Strong. Thus the State really wouldn't Wither away like Marx hoped -The Collapse of the USSR significantly Reduced the Revelencnce of Revolutionary Socialism