Last Sunday, the Copenhagen Zoo put down one of its giraffes. The did not have room for it and its genes were already well represented in the giraffe gene pool by several siblings. In cooperation with the European Association of Zoos and Aquaria (EAZA), it was decided that the space in the one zoo that could take it would be better used for a giraffe with a different genetic makeup.
I’ve discussed this with otherwise rational people, and the sight of the (humanely euthanized) animal being used to feed the lions made them impervious to all logical arguments.
Emotion will trump logic every day. Sometimes, logical arguments are enough to carry the day. But often, they are not.