Let’s postulate two sorts of robbery scenarios.
In one, a lone robber points a gun at you and takes your cash. All libertarians would recognize this as a micro-example of any kind of government at work, resembling most closely State Socialism.
In the second, depicting State Capitalism, one robber (the literal apparatus of government) keeps you covered with a pistol while the second (representing State-allied corporations) just holds the bag that you have to drop your wristwatch, wallet and car keys in. To say that your interaction with the bagman was a “voluntary transaction” is an absurdity. Such nonsense should be condemned by all libertarians. Both gunman and bagman together are the true State.