Every committed political position demands renunciations, so singling out Marxism is unfair
Evidence
The pain of any ethical life is that all fundamental bondings, affiliations, stable political positions, require that one ceases to desire, voraciously, everything that is available in this world; that one learns to deny oneself some of the pleasures, rewards, consumptions, even affiliations of certain sorts. This much Said must have learned himself through his consistent anti- Zionism. Why is Marxism singled out for this pain - and joy - of choosing? Rather, why is Marxism alone associated only with the pain, but not the joy and the ethical need, of choosing? — Aijaz Ahmad, In Theory, 931