Hamas is a response to a repressive Israeli regime. Even if you "wipe out" Hamas, another group will just fill its place.
It's not a matter of just getting rid of the "bad guys" and hoping the forces of good win the day... It requires a monumental shift not only in the treatment of the Palestinians, but in the entire political structure of the area. Which is neither happening easily nor quickly. And sadly, there's not a whole lot we can do to help the situation.