Rand held that the only moral social system is laissez-faire capitalism. Her political views were strongly individualist and hence anti-statist and anti-Communist. She exalted what she saw as the heroic American values of rational egoism and individualism. As a champion of rationality, Rand also had a strong opposition to mysticism and religion, which she believed helped foster a crippling culture acting against individual human happiness and success. Rand detested many prominent liberal and conservative politicians of her time, including prominent anti-Communists, such as Harry S. Truman, Ronald Reagan, Hubert Humphrey, and Joseph McCarthy. She opposed US involvement in World War I, World War II and the Korean War, although she also strongly denounced pacifism: "When a nation resorts to war, it has some purpose, rightly or wrongly, something to fight for -- and the only justifiable purpose is self-defense."