This was my thought, you don’t need cinder blocks in the way. Ice is hard and heavy, that shits gonna fuck up pretty much anything but a bulldozer or tank.
Reminds me of my grandfather, these kids kept knocking his mailbox down with baseball bats. After the second time it was hit, he put up a new one filled with concrete. The very next morning there was half a wooden baseball bat on the ground and a dent in the mailbox. They never did it again.
I’ve heard basically the same story before from a local incident, but with the added bonus of the other side: they used a metal bat and the kid dislocated his arm and was almost pulled right out of the car.