Madoka
It was like the coming of a pink dawn. Rays of light flew over the horizon, first one innocent and hesitant tendril, and then a deluge of radiant glory. It refused to be contained. It consumed the world and erased all boundaries with its brilliant glow.
Kyuubey basked in the light and wondered if this was really all right. There was no awe in him, in so far as humans understood the feeling. But he could expect, and therefore his expectations could be betrayed. He could understand, and therefore there were things that eluded his understanding.
The warmth bathed his frail body, melting and crushing the physical structure that allowed him to interact with objects in this world. He knew the energy released here was something trivial, a mere afterglow of the rebirth of the girl before him. He knew that it had to be incomparable with her full potential, the supernova she would release when maturing into a witch. But the invading light robbed him of the ability to think about such things. This was what it meant to be overwhelmed. For the first time, Kyuubey understood the humans seeking 'God'. He understood the desire to be touched by something infinitely superior to himself and to be rendered insignificant and free for a single, fleeting moment.
The girl moved and the air around them filled with ethereal feathers. The divine pieces of fluff faded in and out of existence, leaving in their wake tiny ripples in the air. But Kyuubey realized the effect was not caused by a disturbance in the mixture of Earth's atmospheric gases. This was physics, logic, entropy and causality undone by a single desire.
"I don't want them to fight and die! Mami-san, Sayaka-chan, Homura-chan, Kyouko-chan, Kyuubey... everyone!"
Kyuubey's kind were not as different from humans as it seemed. Just as humans reached for the power of the atom, unaware of the full consequences, so did the Incubators seek something they could not control or comprehend. A power beyond this entropy-bound universe – the wellspring of emotion.
"I want everybody to be happy together!"
And Kyuubey watched, merely watched, as the words of a frightened little girl tore reality apart.
AN: Because Kyuubey can't reverse entropy himself, but can risk producing entropy-defying, unpredictable magical girls. And nobody can fix things if they get out of hand.
And because the show is awesome in general.