The cost of saving species from extinction will always be removing selective pressures from them. The whole point of these exercises is that we have mangled things so badly that we have to fiddle with the system even more to stop them from being lost due to the general fragility of having a small population. Then, when there is hopefully enough stock (and habitat) to survive, you can let selective pressures act again.
The other issue is that when a species is in extremis like this, selective pressures are likely to heavily deplete the population's genetic diversity, often for very arbitrary reasons (as selection is fundamentally arbitrary).
"Kindly let me help you or you'll drowned," said the monkey putting the fish safely up a tree.
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