Both actual capitalism, i.e. the bad thing, and this which can plausible be argued to be well-functioning market economies, are is often stabilized by adding elements of communism to the system-- publicly funded education, healthcare etc. This is one of the reasons why I as a vaguely socialism-influenced whatever I can reasonably be said to be see communism, i.e. a system characterized by the distribution principle "to each according to his need" as less revolutionary than the socialism distribution principle "to each according to his contribution". Communist distribution principles can coexist with ill-functioning market systems such as things which have degenerated into actual capitalism, whereas the socialist distribution principle can't.