Is our dominion over animals unethical? String theory is nothing more than metaphysics. It cannot be falsified. The multiverse and M-theory are also metaphysics. They may be mathematically coherent, but they may also be nothing more than mathematical unicorns. In other words, they may be complete fictions, and belief in them is nothing more than faith. The probabilities of quantum mechanics may very well be due to epistemic ignorance which could very well mean that we cannot know the laws that determine quanta. Belief that the probabilities are inherent to quantum behavior is faith. Belief that the universe is fully determined is faith. Belief that the universe was caused by a quantum fluctuation that inflated into a universe may very well be a mathematical unicorn.
I prefer to put my faith in God. It makes me feel good, and my conception of God as the conscious creator of the universe relates to our conscious creations of thought, dividing the universe into the existent and nonexistent. I believe that the universe requires a conscious observer to make sense, and God fits the bill.