I’ve nearly been bricked by a crazy and/or violent person while driving. Twice, actually. I can tell you with certainty that this will cause people to slow and potentially invite a wellness check. Bricks have so much utility.
Years ago somebody threw a brick off an overpass and shattered my Dad's windshield while he was on the highway. He drives for a living so he was able to maintain control but it could have easily killed him and others.
There was a horrific video from years back of dashcam footage where a family was driving down the highway and a brick flew through their windshield, killing the wife in the passenger seat instantly. I can't imagine going through that much trauma as a family.
That one is fucking haunting. At least nobody threw that one though, it fell off of a truck heading in the opposite direction. Makes you realize how much we have to just trust that everyone around us on the highway has their shit together.
Sounds like your dad was treated the same way he treats others.
Pollution is not a victimless crime. It causes famines, droughts, fires, and hurricanes. It kills people. The fact that you can't see the people you're killing shouldn't be important. You're not an animal, you're a human who has been blessed with reason enough to understand the consequences of your actions. The fact that you and your dad choose not to use this faculty is not anyone else's problem.