Comment: read again, only slower. 
As I said, the firearm has ONLY one use. 
To kill, 
to shoot a target (of which most are either animals or ppl), 
etc.
What other side effect of a firearm is there? 
Do not say shooting other targets because it is the SAME THING. 
A knife enables you to cut string, pull out slivers, cut up meat, salads, open boxes, etc. 
A shovel's primary use is not to kill, but to dig and move compounds. 
A car's primary use is to move ppl/cargo from point A to point B. You can sleep in a car, but that is NOT its primary use. 

So, what other uses do you have for a firearm?
Otherwise, killing/shooting things is ALL THAT YOU HAVE.