I don't see where it shows there is an obvious overall protective effect from firearm possession.
Additional research is needed to weigh the competing risks and protective benefits that may accompany gun ownership in different communities. doesn't exactly sound conclusive.
"However, other studies conclude that gun ownership protects against serious injury when guns are used defensively (Kleck and Gertz, 1995; Tark and Kleck, 2004)."
And the sentence before that is Despite gun owners’ increased perception of safety, research by Kellermann et al. (1992, 1993, 1995) describes higher rates of suicide, homicide, and the use of weapons involved in home invasion in the homes of gun owners.
I suppose the problem is that I read In fact the CDC report commissioned by Obama after Sandy Hook showed that there is in fact a protective effect (obviously) from firearms possession. and expected evidence showing that the benefits were greater than the risks, rather than a simple citation of research claiming there is a benefit.
It's a long report and sounds like an interesting finding.