Welcome to Earth, Aliens

A farmer was driving a truck with his dog, deer and horse down a deserted, straight mountain road. Suddenly, he encountered a sharp curve and was unable to react fast, and thus he knocked onto the mountain wall, sending all of the animals and himself flying out. He landed fifty metres away from the crash site. Soon, a police man drove by and saw the crash. He examined the destroyed car first, then the dog, which he found out that it suffered from two broken legs. The police man shook his head sadly and shot the dog. Next, he came to the deer, which apparently had its spine broken. Again, the police man shook his head in grief and shot the deer. After that, he observed the last animal, the horse, which had all four limbs and its neck broken. The horse, witnessing the fate of the previous two animals, whined softly before the police man ended it's suffering with a bullet. Finally, the police man came to the farmer and asked him how he felt and apologised for killing his animals. The farmer, upon seeing the police man, scrawled up quickly and patted his chest, "I've never felt so good before."