This quote compellingly highlights a profound paradox within historical narratives concerning morality and power. It reminds us that while fascism is universally condemned and rightly so, other oppressive and inhumane systems such as racism, colonialism, and slave labor camps were also prevalent, often even within the so-called 'good' or Allied powers during the same period. This acknowledgment urges a deeper reflection on the complexities of history—how no side is entirely without fault and how moral absolutism can obscure the realities of systemic injustice.

Howard Zinn's work consistently challenges us to question dominant narratives and recognize the suffering caused by ostensibly righteous powers. This quote fits perfectly within that framework: noting that decency demands rejection of fascism should also demand rejection of any forms of exploitation and dehumanization by any power. It critiques the simplistic binary of good versus evil as portrayed in popular histories, instead inviting us to recognize that decency requires an ongoing commitment to justice no matter who holds the reins of power. Through this lens, it becomes clear that history is not just a tale of victors and villains but a tapestry woven with contradictions that require honest scrutiny and humility.

Ultimately, this challenges readers to develop a nuanced ethical perspective, reminding us that we must hold all systems and governments accountable when they perpetuate cruelty and oppression. As citizens, the lesson here is the imperative to resist injustice universally, not selectively, to foster a genuinely decent society.