We are not against hunting. However, hunters tend to use lead, which has a negative effect on all avian species. Fragmented lead pieces in the environment are scavenged by birds, which have a completely different digestive system, and small pieces ingested through scavenging quickly become fatal.
Many advances have been made in the way of non-lead ammunition; however, it requires an extra step and probably some persuading.
To learn more, check out the other links on this page.