Answer:
Most copyist variants are mere matters of spelling and style and as such are easily discernible. When the text was altered by copyists, no essential teaching of the faith was compromised. The sheer volume of extant manuscripts is more than sufficient to retrieve the original message of the authors. While fundamentalists on the left, such as Bart Ehrman author of Misquoting Jesus: The Story Behind Who Changed the Bible and Why, obsess over their many errors, textual critics render them trite, trivial, and easy to resolve.