This is obviously ridiculous. AIDS is a blood disease, a retrovirus, not a disease caused by anal sex. Anal sex is merely one means of transmission. The same is true for firearms. In the epidemiological sense, firearms are not the disease, they are a means of transmission.
Violence is the disease.
Indeed, statistically, firearms may be the least efficient means of transmission of violence. If we consider violence as the disease, violent crime falls into place. It is then possible to determine ways to inoculate against the disease. The CIMC data can be reduced with respect to handguns. Of the various forms of handguns semi-auto pistols are probably the least efficient.