not that i wanna get into this argument, but people become superheroes out of the goodness of their own hearts, not because the government wants them to do so. if heroes did register with the government that's nothing more than a super powered army
furthermore the SRA will only lead to a totalitarian government, obey the government no matter what, not many people are crazy about that philosophy, note how they tried to arrest Luke Cage even though he didn't use any of his powers since the SRA was passed.
just because it's the law, doesn't make it right, Luke Cage said it himself, Slavery used to be a law