Quinn O’Neill writes at 3quarksdaily:
Given the amount of senseless and stupid behavior that we perceive, it might seem outrageous to claim that people – all people – make perfect sense. The crux of my argument rests on the idea that behaviors are caused, and to the extent that they are caused – fully, I believe – they will always make sense if the causal factors are understood.
This seems to be the approach that we intuitively take when we observe unusual behavior in animals. We don’t blame the animal and label it a dumbass, we assume there’s something causing the behavior, like an illness, the presence of another animal, or the animal’s having been trained by humans. A bizarre behavior could also have a strong genetic component; maybe it’s evolved because it’s adaptive or maybe it’s the result of a spontanteous deleterious mutation. In any case, we’re likely to attribute the behavior to material causes rather than to blame the animal.