Genetic engineering does not necessarily mean that everybody has identical genomes. One of many uses that shies away from that theory entirely is that, if a genome has a high risk of disease, that portion of the genome can be altered. Natural or synthetic genes that improve health, cognitive ability, or any other beneficial aspect of life could be spliced into a persons genome.

This is not creating a horde of identical clones that would soon be wiped out by a plague.

where do you draw the line at "F@#&[ing] with nature"? You claim that genetic engineering is past this line. what about insulin pumps for diabetics? Did G-d/nature make their pancreas fail for a reason, and it is wrong to treat them with evil machines of artificial doom?

Or tylenol. Perhaps G-d/Nature MEANT for you to have a headache- so suck it up and deal with it.

Generic engineering is the next medical breakthrough, just as protein synthesis was a breakthrough in treating diabetes or herbal remedies were a breakthrough in treating headaches. Mankind has always tinkered with nature, how is this step any worse than the million steps required to get where we are today?