The concept is fine and we could do with a few superheroes. (Hancock anyone
)
The problem for this guy is it's in the American constitution the right to bear arms. I doubt that Spandex Suit is bullet proof or even knife proof come to think of it.
As much as i can see the benefits of vigilantism (trust me i would love to get hold of these scrotes that mug old women or jump random people and give them a good shoeing) it would rapidly lead to Chaos if it were condoned by any police force/government.
As much as people complain about the Fuhrer etc..... who is the first person you ring when something bad happens!