Because we can?

"The de-extinction of a Neanderthal looks to be, from a technical point of view, relatively easy compared with the de-extinction of the passenger pigeon.  Yet the very prospect of such an attempt brings into sharp focus all the moral, ethical, social, and environmental dilemmas inherent in the new technology—and indeed in de-extinction science itself."

     Tim Flannery, "Can we bring back the passenger pigeon?," The New York Review of books 64, no. 7 (April 20, 2017):  59 (58-59).