Utilitarianism is not based on the sole axiom that suffering exists. It also requires it to be measurable, to be commensurable between subjects and so on.
For example, take the the rogue surgeon thought experiment. If you only care about maximising the number of living people, it could make sense for surgeons to go around kidnapping healthy people and butchering them for their organs, which can then be transplanted into terminal patients, ultimately saving more people than are killed. However, this doesn’t take into account all the collateral effects caused by the fear and insecurity that this kind of practice would unleash on the general population, not to mention the violent deaths of the victims
A utilitarian society wouldn’t have rogue surgeons, but would have organ harvesting. The maximum utility is gained by harvesting organs in some organised , predictable way, removing the fear and uncertainty.
Utilitarianism is not based on the sole axiom that suffering exists. It also requires it to be measurable, to be commensurable between subjects and so on.
A utilitarian society wouldn’t have rogue surgeons, but would have organ harvesting. The maximum utility is gained by harvesting organs in some organised , predictable way, removing the fear and uncertainty.