The killing of a Guadalcanal Moustached Kingfisher

I'm not particularly knowledgeable on the subject of rare birds, but I certainly appreciate and respect them. Any studies conducted on rare birds must really be a labor of love, and a study in patience... In the following article, researcher Chris Filardi likens the finding of the Guadalcanal Moustached Kingfisher to that of finding a unicorn.

This Yahoo article details how Filardi found and killed an elusive Guadalcanal Moustached Kingfisher, with the understanding that a specimen in-hand is much more valuable to science than photos or blood samples:

http://ift.tt/1GBetFR

(I'm not allowed to post a direct link yet...)

What are your thoughts on the killing of a rare bird for scientific study?