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The classic example of an effective Lawful Good antagonist is Inspector Javert, from Les Misérables. He is a good person who cares deeply about upholding the law, which brings him into conflict wi...
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Source: https://writers.stackexchange.com/a/43437 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
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The classic example of an effective Lawful Good antagonist is Inspector Javert, from _Les Misérables._ He is a good person who cares deeply about upholding the law, which brings him into conflict with the protagonist, Jean Valjean, multiple times throughout the story because Valjean is a reformed thief who had to break parole and assume a different identity in order to get a fair chance from society. Javert's main character flaw is that he (like so many other people in his society) doesn't truly believe that a person like Valjean is capable of reforming and becoming good. Another example can be found in Marshal Samuel Gerard from the movie _The Fugitive._ His job is to hunt down the titular Fugitive, convicted murderer Dr. Kimble, who escaped on the way to death row. Unlike Valjean, who was legitimately a thief, Kimble was wrongfully convicted of murder, but Gerard doesn't particularly care when Kimble protests that he didn't do it because, as the saying goes, "that's what they all say." But unlike Javert, when solid evidence comes up that Kimble is innocent, Gerard is willing to reconsider and eventually turns to helping Kimble. So yes, there are multiple ways to have a scenario with a Lawful Good antagonist acting against a good protagonist and still end up with a good story.