 Why did Pete build killer robots?
The robots were built to serve Man; to do his work, see to his comforts, make smooth his way. "I suppose," he muttered to himself, "that Pete assembled these robots in a batch and then activated them all at once, probably never living to realize that they're tuned to pick up human brain waves, too. The planet's double moon had risen and he could see a robot rolling slowly across the clearing in his general direction, blasting indiscriminately at whatever mind impulses came within its pickup range, birds, insects, anything. Powerful as a small tank, the killer robot was equipped to crush, slash, and burn its way through undergrowth.
 Pete did not intentionally build killer robots. Clearly, something went wrong.
 Pete did not intentionally build killer robots. The robots became sentient and decided organic life forms were the enemy.  Pete did not intentionally build killer robots. Clearly, something went wrong.  Pete did not intentionally build killer robots. The Waiameans must have reprogrammed them to kill the colonists.  Pete lost his mind during the voyage to Waiamea. He just wants to watch the planet burn.