I didn't say “predominantly” at all. Sorry, maybe I misspoke. I said that most licensed gun owners are law-abiding. However, it only takes a small percentage of them who are not law-abiding to create problems. It's just like most youth are law-abiding, but a small percentage of them are not.
Part of the solution—just to say it one more time—to reducing different forms of gun violence is to prevent the misuse of guns by legal owners as well as to prevent the diversion of legal guns to illegal markets. I've published on this.