I have had geckos attack water droplets.
I have also had my cats attack things that are moving and obviously not food.
I have seen MANY things that hunt by sight lunge or at least train in on something that moves in a way similar to their prey.
I do not believe aggression or attacking moving things is at all a form of mental retardation in captive bred animals. Just because aggression isn't typical, it doesn't mean that it is a disorder or a malfunction, but a natural variation among the species.