Most people stick with what they're comfortable with and what suits their lifestyle choices. Regarding the Book of Mormon, M2C is a "safe" belief because when challenged, M2C believers can refer to the plentiful books, videos, web pages, etc. that justify and rationalize M2C.
Of course, for most people in the world, M2C is absurd. Five minutes of investigation shows that the Book of Mormon narrative doesn't fit Mayan culture, and vice versa. Faithful LDS who know and believe what the prophets have taught soon reach the conclusion that M2C is a hoax based on a mistake in Church history.
However, M2C works for many LDS because they don't know what the prophets have taught and they are unaware of the evidence that supports those teachings. Employees and followers of the M2C citation cartel engage in bias confirmation to perpetuate M2C.
Which is all perfectly fine so long as it works for them.
But it's a serious problem for missionary work and retention.
A recent article in the Wall St. Journal discusses the effectiveness of campaigns in changing the minds of voters. There are some similarities that are worth considering.
From the Wall St. Journal:
Do Political Campaigns Change Voters’ Minds?