Like the title says, "gun violence" is a misnomer. It's also nothing more than a talking point designed to instill fear of guns into people.
Why is it a misnomer? Well first lets determine what a "misnomer" is.
Merriam-Webster Dictionary ~ misnomer
Simple definition that does not have any sort of wiggle room to it.
Now, what is the definition of gun violence? Well, going by Merriam-Webster dictionary there is no definition for it. So we have to go for the individual definition for each word.
Merriam-Webster ~ gun
Merriam-Webster ~ violence
So, under proper grammar the term "gun violence" indicates violence caused by a gun.
Problem with this....guns do not cause violence. A gun cannot shoot on its own. A gun cannot walk around and threaten people, things, or animals. A gun cannot use force. A gun cannot cause violence. Period.
People with guns can cause violence. People with guns can walk around and threaten people, things, or animals. People can use force. In fact people can do those things without once holding or even referring to a gun.
So, if you're using the term "gun violence" know that you are using it inappropriately and falsely. If you continue to use it knowing all of the above, then know that those of us that are not so gullible are on to your use of it as a talking point meant to cause fear of guns.