Did European leaders think Hitler and Mussolini were harmless?

Many European leaders initially underestimated Hitler and Mussolini, viewing them as potential allies against communism rather than threats. This perception was partly due to their aggressive rhetoric and the desire to maintain peace in Europe after World War I. However, as Hitler's expansionist policies became evident, particularly with the annexation of Austria and the invasion of Czechoslovakia, it became clear that he posed a significant danger, leading to a shift in attitudes and the eventual outbreak of World War II.