"Humanity has a moral obligation to help restore
threatened populations, but harming sentient beings is
a serious matter that cannot be justified solely on the
basis of noble aims. Killing for conservation often proves
to be unjustified because although the costs to those
individuals killed are certain, the benefits to populations
and ecosystems are not (Vucetich & Nelson 2007)."
See the full article in the latest issue of Conservation Biology.