Imagine this:
Super Hero 1 - A normal human with super powers
Starts as a normal human with a circle of friends and a relationship with a normal girl or boy.
One day, he/she gains super powers.
But he/she continues hanging out with his/her friends, dating his/her girlfriend/boyfriend and having as much of a normal life as possible while using his/her new powers to help others and fight bad guys.
Think Firestorm or Spider-Man.
Super Hero 2 - A super being.
Another super-hero. Origin irrelevant.
Gets super powers and only hangs out with other super-heroes. Flirts with, and dates, other super-heroes. Stays pretty much only in the super hero circles.
Doesn't bother with a normal life because all his/her associates and relationships are all other super beings.
Think 'JLA as the WWE'.
Super Hero 1 obviously has an inclination to protect and help normal people because they make up that hero's world. It's personal.
But Super Hero 2 has no real reason to protect or help normal people because he/she doesn't really interact with any.
Why would Super Hero 2 bother 'being a hero' to the normies?
Wouldn't they be more concerned about protecting other heroes and fighting the villains more for sport or revenge?