Imagine you’re playing tennis. You’re about to serve, but the line judge stops you. You stepped over the baseline before you hit the ball. There’s a small but persistent group of people who travel from one tennis match to another, focused solely on trying to catch people making that same misstep and getting officials to make a call penalizing them for it.

Maybe you and some others are critical of that small group and believe they’re making a big deal out of a harmless error. But it could be argued that a harmless error still breaks the rules, and maybe that small group is doing something good by trying to catch them.

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