For me it would be even more poingant that these people, who have no reason to, do this job. Revenge gives us an insight into the psyche of the Winchesters - our society is filled by people whose motivation is revenge mixed in with this should never happen again.

But take Heroes. The two people I respect the most are Ando and Simone. They have no powers (I'll use present tense), but still they do what they can to help the cause. That's a hero and it would make me love the Winchesters even more, doing it because they want to, not because they have to.

(Can't comment on Batman, can't read comics)