The overall murder rate graph only goes back to 1990, but it peaked in 1980, passing 10 per 100K.
However the firearm murder rate is higher (not to mention the overall gun death rate).
However the firearm murder rate is higher (not to mention the overall gun death rate).
Is the suicide rate going up or down with the murder (not homicide rate). That could tell us some things.
Additionally one could always commit suicide with their weapon they got when they were fine and have that count as a homicide and a suicide.