Propaganda does not inherently mean something is wrong. Capitan America was created as propaganda to encourage the US to join WWII.

Captain America’s creation as an explicitly anti-Nazi figure was a deliberately political undertaking: Simon and Kirby were stridently opposed to the actions of Nazi Germany and supporters of U.S. intervention in World War II, with Simon conceiving of the character specifically in response to the American non-interventionism movement. https://en.m.wikipedia.org/wiki/Captain_America

More recently, the character has certainly been used as propaganda for American nationalism in meme culture