Suppose I grant that pigs and dogs are self-aware to some degree, and do have thoughts about things in the future. That would provide some reason for thinking it intrinsically wrong to kill them - not absolutely wrong, but perhaps quite a serious wrong. Still, there are other animals - chickens maybe, or fish - who can feel pain but don't have any self-awareness or capacity for thinking about the future. For those animals, you haven't given me any reason why painless killing would be wrong, if other animals take their place and lead an equally good life.
Peter SingerBusiness ethics has always had problems that are distinct from those of other professions, such as medicine, law, engineering, dentistry, or nursing.
Peter SingerAfter 9/11, the American Red Cross received more than half a billion dollars in donations to help the victims of the terrorist attacks. The families of the victims were already well-provided for by various government funds, so Red Cross simply drew a line across lower Manhattan and offered everyone there financial assistance, whether they needed it or not.
Peter SingerIf we all think only of our own interests, we are headed for collective disaster - just look at what we are doing to our planet's climate.
Peter Singer