The expression encapsulates the idea that the success of malevolence is contingent not on the inherent power of evil itself, but rather on the inaction or indifference of good people. It suggests a passive enabling, where a lack of intervention or opposition allows undesirable outcomes to flourish. A historical example might be societal apathy towards rising authoritarianism, where the silence of the majority indirectly permits the oppression of a minority.
The importance of this concept lies in its emphasis on individual responsibility within a collective context. It serves as a constant reminder that moral neutrality is effectively a form of complicity. Its benefits are realized in the promotion of civic engagement, critical thinking, and proactive opposition to injustice. Throughout history, this notion has served as a rallying cry for social movements and a philosophical underpinning for ethical decision-making in the face of challenging circumstances.