Why is Iron Man afraid of Captain America?

Iron Man, or Tony Stark, is often portrayed as being wary of Captain America due to their differing ideologies and approaches to heroism. Stark values individualism and technological innovation, while Captain America embodies traditional values and a more moralistic view of justice. This ideological clash creates tension between them, as Stark fears Cap's steadfastness could lead to a rigid enforcement of rules that stifles freedom. Additionally, Stark's self-doubt and insecurities make him apprehensive about Cap's moral authority and leadership.