If it is indeed possible to modify animal minds to such an extent that we would be 100% certain that previously displeasing experiences are now blissful, then couldn’t we extend this logic and “solve” every single problem? Like, making starvation and poverty and disease and extinction blissful as well?
I feel there are crucial moral and practical (e.g., 2nd order effects) considerations to account for here.
But if pure suffering elimination was the only thing that mattered, no one would be endangered, right? I am guessing there are some other factors you account for when valuing human lives?
I suspect we share very different ethical intuitions about the intrinsic value of non-human lives.
But even from an amoral perspective, this would be an issue because if a substantial number of engineered chickens pecked each other to death (which happens even now), it would reduce profitability and uptake of this method.
I partially agree, but even a couple of malevolent actor who enhance themselves considerably could cause large amounts of trouble. See this section of Reducing long-term risks from malevolent actors.