Obviously you've got to be careful when messing around with this sort of thing, but some of those reasons are mute. Presumably, as currently scientists are always careful with this, no one's gonna mess about with viruses any time soon (Wait, we already did that. Read: Myxamatosis. I think). GM crops contain non-natural substances? Example please? To my knowledge they've only put certain things into the plants from other plants usually, so that crop provides certain important elements in it that would otherwise only be found elsewhere. This has been done for growing rice in poorer countries, since such a large bulk of their diet is rice, which otherwise is missing certain important nutrients, minerals etc. that the people need to stay healthy. I can't think of any particularly unnatural substances they could put into a plant that would even work if they're that unnatural. Usually the GM crops sold to us are only slightly modified, so they grow faster than the normal variety, but that's essentially the only difference made. A virus arising is unlikely, as somehow it would have to suddenly evolve to fit that type of DNA, arising from something completely different, to do much harm, and even so it could be contained. This is the case with bananas, all banana plants today are clones as some stupid f*ck decided to grow ones without flowers, so now no more of the original flowered variety exist...idiots. Since all banana plants are clones, they have this problem too, yet they've been fine for many years. Also, DNA surgery on a living person is impossible. The only way it would be is if somehow they could change the genetic structure of each and every cell all at the same time, and obviously that's impossible, and even if we did it, a sudden genetic change to a physical body like that which would then be incorrect according to it's own genes...that's just not possible.
I also hate Catholics going on that this is 'playing God' and that it's immoral. How is it immoral exactly, when it can do such good for people if harnessed correctly? And how is it playing God if it's perfectly within our human capabilities? We are nowhere near playing God.
You just can't stop progress, and this is an example of it. The main problem is if it becomes more widely available, and it starts being abused by people. I can see them making viruses for the sake of war, though whether that would easily backfire and wipe out alot of people. All we can do is hope it continues being used in a responsible way.
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