What makes a hero? Is their desire to stand up for the innocent and protect others somehow innate? Are they born knowing that tyrants must fall? Does a higher power instill the idea that sometimes those least deserving of compassion are those who need it most?
No. A hero's life experience and background make them what they are. That background starts with the culture in which a hero was raised, and is threaded through the career that led them to a life of adventuring.