Again, its the programming, animals and vermin in general may inflict pain and suffering in the regular course of things, but the thing with Good/Evil is that the creature must be inclined to go out of its way to aid others or harm others for their purposes. For most animals this works out to self preservation and reproduction alone, which is the aegis of Neutrality.
Meanwhile the construct is powered by the cosmic concept of evil, and barring direct commands to the contrary, will act to cause harm and suffering to others, even if there is no profit in it.
This is a
great explanation. It's like the Blasphemy spells. It's a spell, it's [Evil], but it does not think independently. It's the manifestation of the forces of darkness, an extension of them.
