That said, your graph is valuable in showing that there is no simple relationship between gun crime and controls. In fact, your graph implies no relationship at all, though I do believe there are relationships, but it is necessary to dig deeper (as John Lott did) to find them.
Correct. The purpose of this graph is to prove that very point - the irrelevance of gun control. I don't seek to show that more guns reduce crime. I will leave that for John Lott. The sole purpose of this graph is to illustrate that gun laws have no effect at all, positive or negative.
Many different factors taken together effect the gun homicide rate of a particular area. The point of this graph is to show that gun laws are not one of those factors.