In counterpoint Id still say one shouldn't invalidate a science just because of the potential for abuse. None of us would like to have surgery without anesthetics right, but the dude on the street corner hooked on the 'done is getting the bad side of the science that helps us by giving comfort when being cut open and having parts rearranged.
If genetic rendering can achieve the same means as line breeding thousands of generations of cattle just to control meat marbling, ratio of feed to poundage gained etc and all the other things agroscience does, it has a validity. theres just as much potential to help as there is to hurt.
The type of engineering I support is the monster sized trouts and salmon that hit the news and made everyone freak out last month. If we took 100 years to line breed them in isolated colorado stock ponds and named them something local we'd all be enjoying them on our plates but someone does it in one generation and all of the sudden its bad. Try to imagine naming how controlling genes for size in an animal could harm a human eating it, you break down the DNA as you digest the animal its genotype is lost in a stomach. its not like they manufacture self poisons or anything, they are just larger or fatter!
we all benefit from that, because you and I like steaks lol
so, why is it bad if a scientist took skinny cattle originating from the african plains (the origin of all our steaks, they rarely eat, are unadapted for adipose body fat stores and had to transform to serve our porterhouse desires) and genetically turned them into a brangus in one fell swoop?