un-nuanced observers talk about it because it's likely largest subset of murders in the U.S. - angenda driven (anti-gun) observers like to talk about it because they can frame a problem in such a way that leads people to the outcome they want - I.e. The obvious solution to ending gun violence is limiting access to guns, and they don't have to address the much more complex problem of violence (for example: if a spouse kills her partner with a gun, and we want to reduce gun violence, we limit access to the gun, but will that spouse just substitute a knife for the gun?)

Put another way - if you could snap your fingers and make every gun in the u.s. Disappear, you would solve the gun violence problem, and undoubtedly reduce the incedence of violent crime, but not completely, and then the question becomes by how much? Which is not easy to answer - especially if we were to translate that to a real world hypothetical