Ueno is a trenchant critic of postwar revisionism and criticizes the whitewashing of Japanese history, which she claims attempts to justify its colonialism, wartime atrocities, and racism both before and after World War II. In particular, she has defended the compensation of Korean comfort women who were forced into prostitution by the Empire of Japan. She is also a staunch advocate of global women's reproductive rights, and a critic of monogamous marriage institutions.