Imo, the most likely explanation for many of the car window shatterings would obviously be from road debris kicked up by passing tractor trailer trucks and other vehicles. Imo, this likely scenario combined with jurisdictional linkage blindness is why two months had elapsed before more scrutiny was placed on these incidents by responding officers.
Linkage blindness is not limited to the lack of communication between municipal law enforcement agencies, but also within each individual department. There are usually a minimum of three shifts in most LEAs. Numerous unexplained shattered auto windows would normally be very low priority incidents, and the sharing of these incidents at roll call/shift change, would unlikely be passed on to the next shift, imo.
Many times there are hidden unspoken indicators in high profile investigations that provides insight as to its magnitude, imo..
Folks, you do not establish a multi agency; local, state, and federal< some agencies unknown>Task Force for unrelated drive by shootings or shattered auto windows caused by kicked up road debris.. Multi Agency Task Forces are usually reserved for recidivist violent offenders; serial sexual predators/serial killers, terrorist cells, etc.. jmo
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FBI - SERIAL MURDER
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https://www.fbi.gov/stats-services/publications/serial-murder
Task Force Organization
Once a serial murder series has been identified, it is important for the involved law enforcement agencies to work together. There are a number of operational and investigative issues critical to the successful establishment of an investigative task force.
Initially, a lead agency for the task force should be designated and will assume the primary investigative role. The choice of a lead agency is based upon a number of factors including the number and viability of the cases, available resources, and investigative experience. Once established, all law enforcement agencies involved in the investigation should have representation in the task force. Any outlying agencies should also be included, even if they do not have an identified case in the investigation.