Why does mutation necessarily lead to a loss of genetic information?

Surely there are ways in which DNA can be imperfectly copied which extend the length of the sequence, thereby allowing more information to be stored. For instance, the phone number 02082087080 could be mis-copied as 02082082087080 ..... and there is an analogue among the possible modes of gene... show more Surely there are ways in which DNA can be imperfectly copied which extend the length of the sequence, thereby allowing more information to be stored.

For instance, the phone number 02082087080 could be mis-copied as 02082082087080 ..... and there is an analogue among the possible modes of gene misreplication.

As long as the organism with the mis-copied DNA survives, there is now surely an opportunity for *more* information to be preserved in its DNA than in its parents' DNA?
Update: Chicken Little -- every creationist website states, and every creationist blindly parrots, that mutation is invariably a loss of information; but they never elaborate as to WHY this is the case. I think that an extraordinary assertion requires extraordinary evidence.
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