Why human keep wild animals in the zoo? Its the same as what keep us on Earth or Universe, maybe we need to go out of the Universe to find out. So what if the Universe is just creator's game? Dinosaur not fun any more and make another kind of being that can invent themselves, maybe carry a bit of creator's intelligence, that is why no other animal have it.

If people love to watch movie and drama, it must be what the creator like about watching us. Make various race to challenge each other otherwise boring also.