Mosquitoes do not cause malaria.
One of a variety of protozoa causes malaria. But not mosquitoes. Nope, not at all. A mosquito couldn't cause malaria if it wanted to.
But then why does the incidence of malaria fall when we get rid of mosquitoes? Why do we advocate getting rid of mosquitoes to control malaria? Why does it work?
Now, tell me why getting rid of guns wouldn't take care of gun violence? (No "yabbuts", please. They aren't appropriate, don't fit, and just a crutch for feeble minds.)