Far more relevant is acquiring knowlege about the reason that individuals are
killing and when/if it matters. I personally find even this issue somewhat
boring because I possess the intellect and the means to avoid high risk
scenarios without feeling geographically constrained. So do most of the
individuals I know who possess intellects which I value.
The greatest hinderance to our pursuit of knowlege and implementation of our
discoveries is not armed thugs but the authorities who restrict our activities
as a rational for protecting us from such thugs. I might add that the
greatest threats to my safety and longevity also come from the "protectors".
Your statistics only serve as a pseudo rationale for justifying their
existance. By using these statistics as a basis for arguing "for" or
"against" you are only legitimizing centralized decision making.