Regardless: pickups start with a major disadvantage in any statistical battle regarding fatalities. First off, they are extremely plentiful (two of the top 5 best selling vehicles in the US remain full size pickups... despite a sharp decline, they remain on top. The #1 ford outsold the best selling conventional passenger car by over 100,000 units, which is a decline from when they outsold the best selling car by better than two to one.) So sheer numbers would seem to make the over-involvement of pickup trucks, as a segment, a foregone conclusion -- sure, there are lots more cars, overall, but not cars falling into any one segment.
They are less safe by design (and as a result of less safety regulation in the US), often modified by folks who don't really consider the consequences of those large tires, 4 inch lifts, extraneous accessories, etc..., and as you mention driven by the worst demographic. They are also massive, and the laws of physics will not be denied. This would be pretty significant in terms of the likelihood of a fatality in a multi-vehicle crash, as well as contributing to the frequency of single vehicle crashes.