It’s straight Leninism: Capitalism can only be overthrown by revolutionary means; attempts to reform capitalism from within such as Fabianism and non-revolutionary forms of “democratic socialism” are doomed to fail.
In going for the jugular it’s necessary to topple the capitalist-engine and capture it’s fruits for later disbursal among more-equals in the new Socialist Order. Who wants a free ACORN condo on the Gold Coast down the street from Oprah?