Well, you say that, but do have any evidence to back up that claim? (And editorials from Fox News or Cato do not count as evidence.) Also, why does it matter how someone dies from a gun? They're still dead. And it's a hell of a lot harder to kill someone accidentally with a knife than a gun.
Defensive homicides? You mean like when family members accidentally shoot each other because the think someone is breaking into the house? Those are still homicides, right? Defensive homicides are also a crime, by they way, except in extraordinary circumstances or in places with incredibly well thought out "stand your ground" laws. Or is there a rash of people staving off murders by shooting the would-be murder that I just didn't encounter living in the US for 30 years?