" I would think, by now, that if it was known the gun had been obtained legally by the shooter the media would be all over reporting that fact."
Why? Surely most guns are acquired legally in the US, because with very little restriction or gun control, it becomes hard to define 'illegally' obtained guns.
Do you have a license like a driving license, and a fee to pay to the state? (like my car tax?) And thus become an illegal gun holder for not paying your fees? I don't understand...
"They have the highest incidence of gun-related crime in the nation. By far." First is was talking about doing things on a far more local level that the state and having individuals be restricted, not the entire population.
Second, who is committing these crimes? And why?
A quick google will show that DC has the highest homocide rate in the states (suggesting that it is an issue related to cities, and affects rural areas less - and it is entirely probably that gun controls in DC are a result of increased gun crime, which makes people feel less safe, not the other way around.)
But when you compare the murder rate in DC to the gun murder rate, you can see that 24% of murders are not commited with guns. (and it is the highest rate remember) Next is Louisianna (the data i have is by state, so i can't compare NYC) and the non-gun murders are only 19%. Maryland then has 30% with gun ownership of half that of Louisiana.
So first i can conclude that high gun ownership doesn't reduce the rate of gun murders in Lousianna contrasted with Maryland. And second Urban areas are more likely to suffer from gun crime, so you can't compare mostly rural state with cities.
And finally, lower gun ownership means higher murders by other means. (as a % of total murders, but absolutely higher)
What does this mean? Well first, you are cherry picking the cities (which had more serious gun problems, and continue to have higher crime rates, and murder rates even if gun murders become a smaller part of the total murders) Second DC has by far the lowest rate of gun ownership in the states. And still has high rates of gun murders, this indicates that most gun owners don't murder people. That it is the very small numbers of criminals who are doing all the murder, and they are concentrated in urban areas.