I think it’s crazy to should arrest these guys, BUT, a good unexpected snowball to the driver’s window can scare the crap out of you. I’ve seen people get out and chase kids who pounded them. If you’ve been sitting stuck for an hour in snowbound traffic, you are already pretty irritable.
One of my brothers was with a bunch of kids throwing snowballs at traffic in a nasty after-school snowstorm. A bus driver got tired of it and stopped the bus. The kids took off. (This was 50 years ago when kids still had some fear of adults.) One of them ran in front of the bus and slipped just as the driver started up again. A front tire ran over the kid’s head.
I can still remember the police coming to our house asking my brother what he saw happen.