Well, Grant Morrison explained it in JLA. In it, Superman gave his reasoning for why superheroes are reactive (handling villains and invasions) rather than proactive (solving all of the world's problems).
Essentially, what he said was that humans need to live to their own potential - and not be the 'pampered lapdog of superhumans'. That they had to stand on their own instead of depending on superheroes and using them as a crutch. In the DC Universe at least, what would achievements like the Olympics or a Nobel Prize mean if superhumans completely took over all aspects of humanity?
And then when Flash asks him 'then what's the reason for us even existing', Superman replies, 'To catch them if they fall.'
Of course this line of logic is debatable (see: Kingdom Come vs. Authority), but I thought I'd just put it out there.
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