This issue involves complex ethical considerations. There are indeed some cases where society regards animal suffering as a necessary sacrifice, such as： 1. Medical research—the development of medicines and treatments that may save human lives 2. Food production-meeting human nutritional needs 3. Ecological Balance Management—Control the number of harmful species However, this kind of "necessity" judgment involves the issue of values, and different positions have different views.： -Utilitarians may think that if the overall benefit is greater than the pain, it is acceptable -Animal rights advocates usually believe that animals should not be regarded purely as a means -Many people support the "3R principle" of reducing pain when animals must be used: replace, reduce, optimize For this issue, it is important to examine our moral assumptions, consider whether there are alternatives to reduce animal suffering, and how we determine when pain is "necessary."