text: In it, she presented her solution to the is–ought problem by describing a meta-ethical theory that based morality in the needs of "man's survival qua man".She condemned ethical altruism as incompatible with the requirements of human life and happiness, and held the initiation of force was evil and irrational, writing in Atlas Shrugged that "Force and mind are opposites".Rand's ethics and politics are the most criticized areas of her philosophy.Several authors, including Robert Nozick and William F.O'Neill in two of the earliest academic critiques of her ideas, said she failed in her attempt to solve the is–ought problem.Critics have called her definitions of egoism and altruism biased and inconsistent with normal usage.Critics from religious traditions oppose her atheism and her rejection of altruism.Rand's political philosophy emphasized individual rights, including property rights.She considered laissez-faire capitalism the only moral social system because in her view it was the only system based on protecting those rights.Rand opposed collectivism and statism, which she considered to include many specific forms of government, such as communism, fascism, socialism, theocracy, and the welfare state.Her preferred form of government was a constitutional republic that is limited to the protection of individual rights.Although her political views are often classified as conservative or libertarian, Rand preferred the term "radical for capitalism".She worked with conservatives on political projects but disagreed with them over issues such as religion and ethics.Rand denounced libertarianism, which she associated with anarchism.She rejected anarchism as a naive theory based in subjectivism that would lead to collectivism in practice.Several critics, including Nozick, have said her attempt to justify individual rights based on egoism fails.