These theories, deontology, the moral rights theory, and utilitarianism, contradict one another. Moreover, they give conflicting (inconsistent) recommendations. It is hence not possible to hold them together, in a pursuit of moral truth.
I look at the most promising putative moral theories. I construct crucial thought experiments in areas where they give conflicting advice. I confront their conflicting advice with my own moral sensitivity, my moral intuition. I take the theory that can best explain the content of my intuitions as gaining inductive support through an inference to the best explanation.