Good article! I think it does a good job of laying out the road debris vs shots debate.
But it doesn't address a similar issue that we are starting to see at another level. We have seen a lot of window shatterings that clearly show some level of human intent. Not many of them are among 'our' cluster of shatterings on or near I-25 in north Colorado, but there have been several other clusters that we've noted on the thread that clearly weren't due to road debris. Some clearly aren't worth our attention, but others may speak to some larger pattern. There is some level of 'background radiation' for naturally occurring stupidity among young males with weapons near roads. Henry Ford is reported to have returned from an early test drive of the Model-T and said "What the hell! Some punk with a slingshot just shot out my window!" (You'll have to give me some time to come up with the citation for that).
There has, however, been an unusual concentration of these clusters in Colorado and neighboring Kansas:
-- The three 6/17/15 Aurora, CO shatterings of moving cars on same block within two hours of one another, with a fourth shooting, two weeks, later of a cyclist, with a pellet gun, only 1.5 miles away.
-- The four incidents that occurred from July to Nov. 2013 around Morrison, CO (southwest of Denver) 2013. Three of them were unexplained, but two of those were within a few hundred yards of one another. The fourth was a report of a man seen shooting across a highway.
-- Mohammad Whitaker, 27, accused of shooting at cars as they traveled on Kansas City, Mo., highways... charged with 18 felonies... accused of shooting into at least nine cars, injuring two of the drivers, in March and April 2014. (About 600 miles east of our NOCO shootings case area).
-- Two shooting on I 435 in Kansas city within 8 days of one another in June 2015. A gunshot wound was sustained in one, and a BB was recovered in the other. (About 600 miles east of our NOCO shootings case area).
I've been searching MSM for reports of clusters of vehicle window shatterings nationwide, and am finding lots. Most, however, involve short sprees hitting parked cars. Very few involve moving vehicles. The CO and Kansas incidents listed above account for most of the ones I've found so far since 2013. I'm still searching, though, and haven't yet concluded that we are seeing something alarming. It all gets back to the business the reporter started with above of distinguishing normal from abnormal.