If you carefully read Kevin Drum’s fascinating MoJo article on lead exposure and crime and other pathologies, you probably understand he wasn’t claiming lead was the sole or even the main cause of violent crime. But he tries to make it clearer today:
If we eliminated every microgram of lead from the planet, we’d still have plenty of crime. So here’s a way to think about it. If you take a look at violent crime rates in America, you’d expect to see a sort of baseline level of crime. That level will depend on lots of things: poverty, drugs, guns, race, family structure, etc. But starting in the mid-60s, we saw an enormous rise in crime, well above any sensible sort of baseline. Then, in the 90s, we saw an equally enormous decline….
[T]he reason we need an explanation is simple: the usual suspects simply don’t seem to do a very good job of accounting for a gigantic, temporary rise and fall in violent crime rates. Within the criminology community, literally no one predicted the huge decline in crime that began in the early 90s. Their focus was on all the usual sociological causes, and they had no reason to think those were going to suddenly improve.
And they were right. For the most part, they didn’t improve. It’s true that the crack epidemic of the 80s burned out, but no one really knows the underlying reason for that. Policing tactics changed in some places, but crime dropped everywhere, so that’s not a very compelling explanation either. Aside from that, poverty didn’t change much, and neither did race or guns or demographics or the number of broken familes or anything else.
The truth is that there’s just not a good conventional explanation for both the huge rise and the huge fall in crime of the past half century. That’s one of the reasons the lead hypothesis deserves such serious consideration. Not only does it fit the data well and make sense based on what we know about the neurological effects of lead. It’s also just about the only good explanation we’ve got.
So those who dismiss Kevin’s story (and they seem to be rare; he even got props for the piece at Breitbart) better come to the table with an alternative theory backed by data.