It embarrasses the perp and theoretically acts as a deterrent for other bad actors. It does nothing to poison the well of potential jurors. That is why both sides have a say in who is chosen from the jury pool and if no one can be found, a change of venue can be submitted.
I worry more about local prosecutorial ethics than Federal. This publicity just puts more eyes on the case and less chance of shadiness. I didn't hear all this pearl clutching when they perp walked Dzhokhar Tsarnaev in Boston.
It is an absurd practice regardless of the accused and is a waste of time and resources. It tampers with presumption of innocence, panders to sensationalism, and is just a base form of humiliation. We can do better.
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Let's say we meet in the middle and say we agree it is a waste.