Genetic mutation is a neutral process. Results of these are usually not good but at times they are good/useful and genetic mutation I believe is responsible for evolution (i.e what we are now!!!!)
We would not have evolved to exist without genetic mutations in our ancestors. I think that it can have both good and bad results, with some mutations being very useful and others dangerous.
It depends if it is natural or man-made. Certainly we have developed massively from natural genetic mutation (we used to be monkeys, right!). Man-made mutations can be a little more scary – especially if the mutation has not been around long enough to analyse the long term effect of it. This is why people are scared of GM food
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darkopsdisguised commented on :
nice answer