Find the keystone.
What holds everything together?
"The Book of Mormon is the keystone in our witness of Jesus Christ"
"The Book of Mormon is also the keystone of the doctrine of the Resurrection"
"Finally, the Book of Mormon is the keystone of testimony"
"Just as the arch crumbles if the keystone is removed, so does all the Church stand or fall with the truthfulness of the Book of Mormon. The enemies of the Church understand this clearly" (1)
The last few books in The Book of Mormon tell of the people in the ancient Americas being destroyed by corrupt politicians who followed satan.
You are watching a movie.
How would one change a book to make every one believe it is the only truth?
The Bible tells us that it is the only word, there is no other and anyone that claims otherwise is a fraud.
Would God really only share his word to a single nation of His people?
People will say we have a Bible, we don't need any more Bible. (2)
Would those corrupting the world only change our history books and not true history (Bible)?
The book that will go to the world from the Jews (Bible), and it "hath gone forth through the hands of the great and abominable church, that there are many plain and precious things taken away from the book". (3)
Would the corruption around the world only have started within the past few hundred years?
Satan plotted with Cain to murder his brother Able, and created a secret society of followers "who spread the works of darkness and abominations over all the face of the land". (4)
Would this group corrupting the world only exist in one place?
"Hath he not read the record which our fathers brought across the great deep? Behold, is there not an account concerning them of old, that they by their secret plans did obtain kingdoms and great glory?". (5)
Logical thinking.
(1) https://www.churchofjesuschrist.org/study/general-conference/1986/10/the-book-of-mormon-keystone-of-our-religion
(2) https://www.churchofjesuschrist.org/study/scriptures/bofm/2-ne/29
(3) https://www.churchofjesuschrist.org/study/scriptures/bofm/1-ne/13
(4) https://www.churchofjesuschrist.org/study/scriptures/bofm/hel/6
(5) https://www.churchofjesuschrist.org/study/scriptures/bofm/ether/8