Looking a bit closer to home, the opinions towards hunting of game birds are less firm. After all, the species shot are common (e.g. grouse, pheasant) and often bred for this exact purpose. This sport can be an important input into the economy, for instance on some estates people pay £175 for every 2 birds they shoot, as well as being ingrained into some societies.
I believe that this persecution of raptors is equally as unacceptable as ivory poaching of elephants and it needs the same level of attention to prevent further losses to our native birds. All animals populations on this earth are precariously balanced due to their daily battles with human actions. We cannot afford to abandon any of them, even if they are seemingly recovering as in the case of the buzzards, if we want to keep them in our world.