Culling is vital to healthy populations and balanced ecosystems. Animals don't have medicine, so the sick or diseased amongst them can spread susceptibility to

Culling is vital to healthy populations and balanced ecosystems. Animals don't have medicine, so the sick or diseased amongst them can spread susceptibility to illness more readily, over time making groups more genetically or immunologically prone in a way that could lead to destabilization, become vectors for contamination (some cancers are contagious, like in dogs, and prions don't break down easily, making them true ecohazards), or end up as vectors as they contact other animal populations (HIV and swine flu were non-human origin). Predators also encourage migration of herds, so deer won't consume an environment to depletion, including crops. Predation is nature's free labor!