 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 metal killers, tuned to blast any living flesh, would murder them the instant they stepped from the ship! 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.
 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.