What conclusions could you reasonably formulate and how accurate do you think they would be? Whatever conclusions you formulated would only be applicable to the group you studied. They would have no relevance to any other group or even regionally or worldwide.
Really? So, if I studied a large group of 65 year-old white males in New York, say for the efficacy of a new hypertensive medication, any conclusions made about how effective it was and the risk/benefit ratio couldn't be used to extrapolate possible results for a similar group in Florida? How exactly do you think folks that do a lot of research, like drug companies, get the OK to proceed with testing on larger and larger groups? That's right, from small groups. Are they always right? Nope. But they are sometimes.
All I am saying is, that in light of the lack of information from well controlled studies on the subject, we have to use what we have. Somewhere between your "there is no information 'cause it's not a level 1, randomized, double-blinded study" and "it's the Gospel according to Kleck" there is a middle ground. One that will look at the available data, judge it's relevance and reliability, and formulate a conclusion. That is the nature of research. Heck, even with good, well controlled studies, things can get confusing. Just look at the back-and-forth on the HRT stuff out there. There's lots of information about that, and much of it level 1, and all of those doctors arguing the pros and cons are surely not uneducated on the subject.
So what conclusions could we get from an admittedly less than great scientific study, such as the one that spurred this debate? How about that, in general, increased concealed carry won't cause folks to go out shooting each other any more than they already do. Or, that based on available data, it doesn't seem likely that the Brady claims of boatloads of innocent bystanders getting shot isn't reality based. That's not terribly specific, but it's something factually-based, and it's better than nothing. And, who knows, maybe it will spur more research on the subject....yours included.