Ban guns? Preposterous.
Just let anyone over the age of 18 have access to firearms? Equally preposterous.
It's so easy to kill using a gun. You don't need to get up close and personal and stab several times, covering yourself in the other's blood. You don't need to watch the victim struggle whilst squeezing the life out of them. You just aim, and fire, and if you do it right, that's a one shot kill.
Banning, or reducing the availability of firearms, is at best, a short-term solution for a long-term problem.