There are a lot of species that are naturally beautiful... So what if someone figured out how to take a fish that's easily bred and make a little extra money from them?
Oh, and concerning the writers of the article who claimed it would be like us getting stabbed by pencils??! Fish cells are to scale smaller than our cells? Fish nerve endings are much much smaller than our nerve endings?? There really isn't a difference, plus I'd bet that the people dying the fish are anesthetizing the fish ahead of time... otherwise, it'd be a pain in the neck to work with the fish.)