YouTube proposed me an essay on that yesterday, with a sub-title of : An analysis of the dissonance between morality and heroism in stories, and the reality and moral complexities of our modern society.

It raises some points regarding the questions you pose, you may find interesting. I'd love to do the TL;DR but it's slightly more nuanced than that so I'll post the link

https://m.youtube.com/watch?v=tooiNm9WmkM