Is there more to heroism than "socially integrative behavior under duress"?

Whether the single mom working three jobs or the soldier giving up his spot on the chopper out of the kessel...

But the more contested definitions are interesting: what about deliberately socially disruptive actions, and not necessarily under duress (from more than a chronically 'degenerate' society, at least).

On these terms, the successful bomb-lobber seems distinct from the previous examples. Is there another formulation that would link them?

As for the causes of heroism, well, that's a matter of value: what the hero values - this informs action - and what the labelers value - this informs the selective appellation of "hero".

In sum: there's nothing banal about the unusual or exceptional - by definition; on the other hand, the roots are...