State ownership of capital is the definition of socialism. In as much as anyone uses your term 'state capitalist', they use it to refer to the heavy-handed control of markets by government in places like China.
As to the departure from capitalism: when you depart from free markets without some seriously strong restraints to prevent further movement, you're always moving toward the same endpoint of non-choice and stagnation, but there are plenty of trajectories to get there. In the US, we enact well-meaning policy to protect our hallowed institutions or to protect the disadvantaged. The resulting distortions in knowledge conveyed by prices create arbitrage opportunities. Organizations/companies that can find and exploit those opportunities can grow powerful, and then they can sink in their talons to further distort and fossilize the market to their advantage. In the middle term, we have a different small group of people who get rich at others' expense, but it's a race to the bottom just like any other. Our confidence in preventing that decline is a finesse, just like in bridge: we're handing over control in the hope that we can both effect an intended change and regain control. That's a good trick for as long as you can keep it up.
Having said that, I think it's bizarre to say that any system's purpose is to destroy the world, even if that is the probable end state.