"C" does not add up from "B" and "A"
Nor should it. "C" is for all firearms related deaths, not just murders.
The FBI UCR for 2011 shows there there 12,644 murders in 2012. 6,220 were committed with handguns, 323 were committed with rifles. The percentage of murder with carried out with handguns was 6,220/12,644= 0.49 (49%) while the percentage with rifles was 2.5%.
The percentage of all homicides with a handgun is meaningless since it would include legitimate self defense shootings, gang on gang, police shooting criminals, and suicides. Without parsing those deaths there's good shoots and bag shootings mixed together.
While the violent crime and murder rates have been dropping since the AWB expired so have the total firearms related death rates. The ratios for all homicides
might be stable, but the overall rates themselves have been dropping for violent crime and murder and firearms related deaths.
This has been going on for 20+ years while the firearms most often purchased by law-abiding voters and law enforcement are the firearms that prohibitionists want to scapegoat as somehow related to high rates that are actually the lowest in a generation. The data is out there, but the claims by prohibitionists don't sync with it.
If these firearms are more popular with citizens and the rates of murder and homicides have been falling then we don't have a national problem with firearms. What we have is politicians with out of date ideas.
President Obama pointed out in the debates, "in my hometown of Chicago there's an awful lot of violence, and they're not using AK-47s. They're using cheap
handguns,". That is the same in almost any city in the nation. "Cheap handguns", not $400, $500, $700, $1,000, etc. handguns that we would buy, but cheap "junk" that heaped up in bins in evidence rooms. They have tape holding the grips on (or in place of them), they're rusted and nothing proposed by any
ban will touch them.
We need to solve the root causes of violent crime and not allow politicians with a failed 20+ year old agenda and no new worthwhile solutions to violence in America dictate to the entire nation from their personal ambition and fear.