I would think the important metrics are the delta (the change) and the expectations.
In Detroit, people used to express their disapproval of other people’s driving with horns and various gestures. Now they express themselves with guns.
March 16, 2022
Driver shot on Southfield Freeway in Dearborn; police seek information
https://www.fox2detroit.com/news/driver-shot-on-southfield-f…
Jul 09, 2021
2021 is on track to be the deadliest on record for road rage, data shows
So far this year, Michigan State Police have responded to 26 freeway shootings in metro Detroit, 4 of them fatal. Seven resulted in injuries, and 13 of them were road rage.
According to Everytown for Gun Safety, in the U.S. there have been nearly double the number of road rage deaths and injuries in 2021, compared to any other year on record, estimating that every 18 hours, a person is either injured or killed in a road rage shooting.
https://www.wxyz.com/news/2021-is-on-track-to-be-the-deadlie…
As noted before, over several years, the US has slid toward being a very violent and brutish place. Historical norms are no longer relevant.
Steve