This re-instated what passes for faith in humanity

[whyBish]

A mutation is a defect, while something good happening is something else entirely. When you gain something, it evolves, but it is not a mutation.

I hope I did a somewhat reasosnable job of trying to explain this.
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Well that makes things a lot clearer... you have been reading creationist literature. Creationists believe that the world was made perfect, and so the thought that a mutation can make something better (than gods perfect starting point) is abhorrent to them.