I think about Waukesha and Boston.
Some people are just killers.
It's true. We can't rid the world of violence, even if we rid the world of people. It turns out animals are violent, too. Heck, storms can be violent.
I'm a cyclist. I ride my bike to work 3-4 times a week, and worry everyday about the crazy things I see people do in cars. The carelessness and recklessness is scary. But firearms--not motor vehicles--are the #1 killer of teens and children in the U.S. That's stunning, particularly given how ubiquitous traveling in cars is (and how bad so many drivers are).
Lingering for a moment on the difference between gun violence and violence committed with other tools. The purpose firearms exist is to kill things. Literally. In fact, there aren't really other uses for them. One could suggest target shooting, but what is the purpose of target shooting? To show prowess with the firearm, whose purpose is to kill (animals or humans).
That's not true for anything else on your list. Could we have a katana violence problem? Yes, I suppose so, but somehow we don't. (To be clear, someone was killed in my county with a katana within the last couple of years, it was really gruesome, happened on a public street in broad daylight. WTF.) Same for a bow and arrow violence problem. I'm sure there are bow and arrow murders committed, but it's not exactly an epedemic.
So yes,
gun violence is different.