Because an arm grabs your body, but a tongue grabs your legacy. A fugitive can run from the long arm. He can cut off an ankle monitor. He can flee to a country without extradition.
But he cannot outrun the long tongue.
Consider the trial of Oscar Wilde in 1895. The "arm" of the law merely sentenced him to two years of hard labor. But the tongue —the brutal cross-examination regarding his "the love that dare not speak its name"—destroyed his soul and his art forever. The words spoken in that courtroom ruined him more than the prison walls.
Or think of the Nuremberg Trials (1945-46). The Allied powers could have simply shot the Nazi leadership. Instead, they used the long tongue of the law: months of testimony, documents read aloud, and a final judgment that called the Holocaust "the most horrible crime in human history." The tongue labeled them, shamed them, and wrote their infamy into eternity. Of course, the long tongue is not infallible. Sometimes it stutters. Sometimes it is bribed into silence.
We have all heard of the "long arm of the law"—that metaphorical limb that can reach around corners, across state lines, and into the darkest hiding places to drag a fugitive back to the dock.
The worst injustice is not a failed arrest (the arm missing its grab). It is a failed prosecution (the tongue telling the wrong story). Ultimately, why does the "tongue" metaphor matter?
But there is a lesser-known, far more unsettling sibling in the idiom family: