But by not changing the system in a meaningful way (capitalism and state), the rich could stay rich and get richer over time by the means of exploitation and lobbying the leaders. And that's how we got to neoliberalism and concentration of wealth and power especially from the 70s and 80s onwards.
This is not to discourage people, who want change, but to critizise the notion that you can use the tools of power to build a better world in the long run. (2/3)