Crap like this is why the CDC got slapped down,

and why we don't trust them.
Now Kleck has unearthed some lost CDC survey data on the question. The CDC essentially confirmed Kleck's results. But Kleck didn't know about that until now, because the CDC never reported what it found. 
(Gee, I wonder why...)
Kleck's new paper—"What Do CDC's Surveys Say About the Frequency of Defensive Gun Uses?"—finds that the agency had asked about DGUs in its Behavioral Risk Factor Surveillance System in 1996, 1997, and 1998.
...
For those who wonder exactly how purely scientific CDC researchers are likely to be about issues of gun violence that implicate policy, Kleck notes that "CDC never reported the results of those surveys, does not report on their website any estimates of DGU frequency, and does not even acknowledge that they ever asked about the topic in any of their surveys."


So the 'non-partisan' CDC did a real study, found LOTS of defensive gun uses, and buried it.  Then bitched and whined when called on playing political games.