After studying about it, I believe Esther was included in the Bible by mistake by the Church council around 300.
* the Dead Sea Scrolls contained copies of every Old Testament book except the Book of Esther.
* Melito’s canon is the earliest recorded Old Testament canon we have in the Christian tradition. Again, Esther is not found here.
* Martin Luther, for example, criticized the Book of Esther, accusing it of being too aggressively nationalistic and containing no gospel content
* Esther us never mentioned in any other book of the Bible. Esther and Song of Solomon are the only “books of the Bible” with this distinction.
* God is never named in this book.
I don’t doubt the Bible’s infallibility, just that the books were Canonized by fallible humans, and this is the only book included in error.
Personally, I am happy to settle for the counter-argument that God would not have tolerated Esther’s inclusion in the canon for the entire church age unless it is His will. Squatter’s rights, in essence. To me, that’s conclusive.