I see what you mean, but on the topic of rescuing kittens... Dunno where you live, but where I am, firemen get called by people all the time for all sorts of menial tasks. The whole "I've got a pesky goblin in my field - oh hey, I'm going to bug the crap out that guy who kills dragons, he can get me rid of it" is not that unrealistic a reasoning for your basic person.
Hero refuses : "whine whine who do you think you are ? Think you're better than me ?"
Now I get that to be interesting, NPC in a game should react more like random villagers react to a hero in a story, than like actual people would. Still, I'm always amused at things that take down the whole hero thing a bit. And anyway, I don't think we'll come short when it comes to epics.