Yes, I know you don't need to map DNA in order to clone. If you read what I said, I said there's 2 ways to clone something, one of which requires the DNA to be mapped.
While yes, during cloning, something can go wrong which causes the animal to get mutations. In all due respect, the same thing can happen "the real" way. It's a risk that's always there, no matter what way something is "created" in.
Normal cloning is done by taking the DNA from another animal, and inserting it in to an egg. The other option is to "create" the DNA yourself and that requires you to have the DNA 100% mapped.
we're still rather new to cloning, which is why "misstakes" in the form of mutation happens more often then it normally do. But as we get better on it, misstakes are more unlikely to happen. And I doubt they'd slaughter an animal that is heavily mutated.
Every sentence you quoted wasn't false, apart from the "Unless you
want there to be". But that is also partially true, in that while yes, normal mutations can happen just like irl, it doesn't suddenly make the animal poisonous etc. And as we get better on it, normaly mutations will be less likely to happen, too. It was true, you just seem to have missread it