Why Are We Still Just Talking About Gun Control?

Last week's deadly shooting in Aurora, Colorado at a midnight showing of "The Dark Knight Rises" is fresh in our minds. As we watch the media coverage of grieving families and shocked residents of a peaceful town, and as we begin to watch the legal fallout play out as the gunman faces criminal charges, inevitably, people start discussing gun control. What I want to know is, why do we even still have to discuss this?

Why don't we actually DO something about it??

Photo from saf.org/lawreviews