It does
Try this;
32,000 per year
over 79 years, that's 2,528,000 deaths.
During that time you, as an individual of average lifespan (79years) are one of 318,000,000 in the country (assuming steady population). 318,000,000 divided by 2,528,000 is 126. One in 126 chance you will be one of the ~2.5 million who die in your lifetime.
To put it another way, if life expectancy is 79 years, and population is 318 million, then 318 million people will die over the next 79 years (assuming a flat age distribution), of which 2.5 million will die by firearm
The US isn't a good metric though for what would nominally happen with allowing general ownership of firearms - the Swiss for instance have very similar levels of gun crime to ourselves yet have over 9x the amount of firearms owned by civilians, Canada has a pretty high density of ownership yet gun related crime is minuscule compared to the US (this is ratio based - not comparing on the raw number of incidents) and there are other parts of the world where firearm ownership is much much lower than the US yet have higher rates of gun related crime and homicides.
There is a lot more to it than simple maths.