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I don't think that cloning is the central issue here. The thing that people have a problem with is the replication of conciousness. If we are/will be able to duplicate someone's conciousness, then we may be in for a bit of a problem ethically, as both would see themselves as the "main," which one has the soul, etc. etc.
As far as biological cloning goes, it isn't far removed from the natural biological processes that are abount in the world already. asexual reproduction is essentially cloning, as the new lifeform is essentially the exact same as the old (sea cucumber). As far as more complicated life goes, Human reproduction is vastly more powerful than cloning ever could be. If we started cloning ourselves, or if we had been a species that reproduced by copy, the odds of being completely wiped out by a single biological event is vastly increased.
In other words, one fatal disease could easily destroy a whole society of clones, whereas, in the world we live in today, no one virus could kill every human, as some of our kind will have mutations from genetic combination that prevent a single virus or epidemic from taking the race out. Also, goodbye evolution, if cloning takes over. Without genetic diversity, or if we take over our reproductive capabilities, we can't expect to have any random mutations that benefit the race.
I doubt cloning will catch on, beyond growing new organs, which isn't so much a problem of cloning, as it is one of actually GROWING them. Genetic diversity is too powerful to substitute for an easy clone.
Plus, good luck getting people to stop screwing each other... I like sex.
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