Opinion: Yes, we need more research, and the industry should support it

President Obama is asking Congress to fund further research into the root causes of gun violence including -- as he famously singled out -- violent video games. But is more research actually necessary? And should the video game industry support it? We asked researcher Cheryl Olson, co-author of Grand Theft Childhood and an attendee at last week's meeting with Vice President Joe Biden, to share her thoughts.