We can only ever have correlational statistics in relation to crime. The effect of adding police officers is correlational, just as the effect of jail time, and arrest rates. The statements of prisoners is very important, because it gives us a good reason to craft a theory of why the correlation exists. In this case we suspect CCW causes a drop in crime because criminals defer some crimes for fear of armed resistance. Then we look at the numbers to see if the theory holds up. And as time goes on, we can confirm if behavior continues to conform to the theory. It is important to note that Lott's study published in 1994 was based on data from 1977-1992. The studie's conclusions continue to hold when faced with data from 1992-2000. I posted a link to a review earlier. Note, the correlation only holds at the 10% significance level.
The baby boomer age argument is new one to me. If he has some study, to back this up I have never heard of it. However, I am aware that there are many studies on CCW, off the top of my head, I think 17 found it reduced crime, 4 found no significant effect, and one found it increased crime rates. I am only really familiar with the Lott study, which found a decrease and the Nagin study, which found no effect, so I can't comment on how good all of them are.
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If you are interested in a quick overview of the information, the most non-biased source I know of would be the book "
FIREARMS AND VIOLENCE" from the National Acadamies of the Sciences.
http://books.nap.edu/openbook.php?re...=10881&page=R1 (this is a free online version of the book from their website, the review is rather short, but it helps to be familiar with stats to understand the debate.)
Lott is covered in Chapter 6, appendix A, B, and D.
Brief overview of their findings, they can confirm Lott's basic findings from his data, several other studies also find similiar effects, but other studies find no effect or even an opposite effect. Furthermore, while almost every test shows a reduction in crime, the effects are almost all statistically insignificant at the 5% level. His original paper covered 1977-1992. The effects he published held true with new data from 1992-2000, but the effects were less pronounced.
However, they do not cover any of the other studies that have found a connection between concealed carry and violent crime.