[pangram]

I'm not sure that whether the individual believes there is a reward is relevant.

Example: atheist terrorists -- atheistic suicide bomber, say -- would be heroic because they don't believe there is a reward?

[lujim]

Are there atheist suicide bombers?

[anandr2013]

I get what you are trying to say, and i think it boils down to how you define a hero. If you had asked me about a heroic act, my definition would be very close to yours, while for a hero, my definition has now become, as you put it, a little watered down, thanks to how the word hero is used in todays culture.

On a related note, would you consider someone like Ozymandias (https://en.wikipedia.org/wiki/Ozymandias_(comics)) a hero?