Most vegetarians would think that activities that normally make animals suffer are bad in themselves. They may have originally have used suffering as a reason to figure out that those activities are bad,m but they're bad in themselves. You can't just take away the bad consequences and make them good.
Also, utilitarianism has a problem with blissful ignorance. Most vegetarians would probably think that animals that are engineered to be unable to suffer have a blissful ignorance problem; they are being harmed and just don't realize it.
Most vegetarians would think that activities that normally make animals suffer are bad in themselves.
Presumably the moral win in reducing or eliminating the suffering of farmed meat would have more to do with non-vegetarians than vegetarians. But really, is the point here to do something better than is already done, or is to impress vegetarians?
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.
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