Civilians who live in a superhero-oriented world will find themselves, almost on a weekly basis, being kidnapped by a supervillain or find out that the city has been taken over by aliens. As scary as this sounds, it should all work out in the end. After all, it's only a matter of time before the Justice League or the Fantastic Four nip in to save the day.
But what if the heavy hitting Supers are busy? What do you do if Batman gets lost in time or Captain America is temporarily dead or Thor is trapped in another dimension? Who comes to your aid then?
Now, if there are thousands of superheroes populating the planet, surely someone else will save the day, right? They may not be as well-known or as skilful as the X-Men or the Avengers but it doesn't matter so long as they're there to help, surely.
Sadly, some vigilantes just aren't reliable. Superheroes can be erratic, dangerous, bad-tempered, or highly radioactive. Even if you found yourself in the direst situation possible, these are the last superheroes you would want to save you.