Wasn't the LA shooter a "law abiding" citizen?
A "law abiding" citizen can become a "non law abiding" citizen after three beers. Or after a highly emotional divorce. Or after being dismissed from his or her job.
The fact that a person has BEEN "law abiding" does not mean that they will remain "law abiding", as so many of these shooting events establish.
People with mental health issues are "law abiding", yet they have access to firearms.
The argument that only criminals kill people with guns is fatuous.