Lott is making things worse by drawing a correlation that hasn't been shown to exist. This is the same thing that anti gunners do in reverse, and it shouldn't be done at all. Doing it ourselves makes it fair game for them to do it, but it's a logical fallacy and shouldn't be done at all.
Just because two things happen at the same time or after another thing does not mean they're related. False correlation and ad hoc fallacies are very common in anti-gun arguments, and they need not be made to further a pro-gun stance. Remember, the burden of proof is on them to tell us why we shouldn't be allowed to own what we own. Claiming that we should own them because they reduce crime rates suggests that we need to prove a reason to have them.
The fact that it cannot be shown that the presence of weapons in responsible civilian hands increases crime rates is good enough for me. All the money that the CDC spent researching gun laws and their effects--and turning up nothing--is a vindication in and of itself. We needn't take it to the extreme.
I would respectfully submit that Lott needs to be careful or he'll end up being more valuable to the other side of the debate than he is to ours. Try talking to some Canadian left-wingers about U.S. gun laws sometime. Lott is well known among that crowd, and he'll always be brought up and called bad names for the Rosh incidents, and his coding "errors," and so on and so forth. It'll also be insinuated that you, being on the same side and being "associated" with Lott and his kind, must be dishonest as well (guilt by association). I'm not saying that this is fair, but that's the way they think and Lott has become a tool for these people to attack you with.
Let's face it, these "studies" that are commissioned by anti-gun policy groups and thinktanks, from Kellerman all the way up to today, do not vie well under peer review. I don't see a huge need for additional studies to "prove" we need guns while ignoring how easy it is to demonstrate that their attempts to "prove" that we don't are utter failures in the majority of cases.