[jessaustin]

nor does it imprison more people

At any particular point in time, there is a greater percentage of the population in prison in the USA than there is in any other nation in the world. We have the highest incarceration rate in the world. It is reasonable to generalize that to "the USA imprisons more people".

Nice non sequiturs with respect to graph scales and lead exposure, though! Our population hasn't been increasing exponentially: why would any population-based statistic be doing so, and why would we want to hide that fact if it were? Also, tetraethyl lead was used at some time in most countries, and indeed is still in common use in those that don't have strict environmental regulations. We still have the highest incarceration rate.

If you're brave enough to see the real explanation for these trends, take a look at this chart: http://bjs.ojp.usdoj.gov/content/glance/exptyp.cfm