Why do people keep leaving their GoPros lying around wild animals and then get surprised when they are taken?

Mason Colby had left his one down next to a group of Bald Eagles eating salmon, only to have it snatched by one hungry bird and flown a mile away before being dumped in a forest when it realised the camera wasn't edible. It's just like being a hobbit in Lord of the Rings, just with less fire and brimstone and loss of digits.