Pope Leo XIII also expressed concerns about the Cultural liberalism of some American Catholics: he pointed out that the faithful could not decide doctrine for themselves (see Cafeteria Catholic). He emphasized that Catholics should obey the magisterial teaching authority of the Church. In general, he deemed it dangerous to expose children to schools that would prove to be detrimental to their Christian upbringing. The Pope derided the idea that all opinions should be aired publicly, as he felt certain speech could harm general morality. He also condemned the biography of Hecker and Americanism.