Zeta squad raced through the lower levels of the moisture farmer’s house, overturning tables, ripping doors off cabinets, smashing metal lockers with their blaster rifles until the containers popped open. One by one the stormtroopers checked in with Captain Terrik: “No sign of the droids, sir."
Davin watched the storm trooper in front, of him kick over a vat of oil before heading to the upper level. The moisture farmer’s house was a shambles.
“Zeta squad check in and form up,” said Captain Terrik, his words clipped and precise in Davin’s helmet.
“Ten twenty-three,” said Davin. He tried to control his breathing, but the thought of what was going to happen next nearly overwhelmed his senses. He trotted into the bright Tatooine double-sunshine and stood at attention with the rest of his squad. Captain Terrik stood in front of the moisture farmer and his wife, just outside of the house. The moisture farmer’s face was bright red with anger; the woman cried, her head down. Davin flicked his outside audio sensor on with his chin and listened to the exchange.
“… you men are nothing but criminals! I told you I haven’t seen those droids since last night. And look what you’ve done to my house! The governor will pay for this.”
“This nephew of yours,” said Captain Terrik, his voice modulated by the speaker in his battlesuit, “one more time: Where did he take the Artoo unit?”
“Haven’t you been listening?” The moisture farmer shook a fist in the air. “I don’t know - and now I would not tell you even if I did know! You Imperial thugs are worse than I imagined.” He stepped up to Captain Terrik’s helmeted face and spat; spittle ran down the officer’s helmet.
Captain Terrik made no attempt to remove the spittle. “Where is the boy?”
“I never did care much for the Rebel movement; but now I hope they find every one of you bantha slime and grill your carcasses!”
The moisture farmer turned and put an arm around his wife, drawing her near. The two turned away, back toward their home.
Without emotion, Captain Terrik nodded toward the stormtroopers. His voice came over the secure link. “There’s only one place the boy could have taken the droids - into Mos Eisley, to escape offplanet. Zeta squad, load up. Floating fortress, this house needs to be left as a reminder of what happens when quarter is given to Rebels. Fire when ready.”
Turning quickly for the cargo skiff, Davin Felth pushed aboard and kept his eyes averted from the blast on the house. A sour taste clawed up his throat. First they executed the Jawas, and now these humans. And over what - a couple of lousy droids? What could be so important that it deserved executing these people?
On his home planet, joining the military had seemed all fun and games, his chest swelling with pride as he had boarded the ship to transport him to Carida. But now, this was reality. People were dying, being indiscriminately killed.
The cargo skiff lifted off the ground, giving Davin a view of the carnage below. Smoke drifted up from the house. He could see the charred remains of two bodies lying in the scorched sand. As the skiff wheeled toward the desert city of Mos Eisley, Davin didn’t know what he would do if he was ordered to kill.
Source : http://boards.theforce.net/threads/why-did-the-stormtroopers-kill-owen-and-beru-and-then-burn-their-corpses.50043693/