Every group tends to be more critical of those things they love. They really do nitpick because they care. To use a musical example, the Indiana Jones soundtrack collection has some reviews on Amazon that tell people exactly what parts of the scores are missing and where certain snippets can be found. They love the music of the series, so they want all of it to be available. That's the same attention to detail that Trekkers have for plot inconsistencies and logic errors. We all want our favorite things to be perfect, but very few of them can meet those high standards.