I fear we're not bringing our children up with good morals. That could have been me, driving -- or any of us. What a senseless waste.
Perhaps a copycat, as well? In the movie "The Good Son", the "bad" son throws a dummy off a bridge, to make it look like a suicide, and causes an accident. Then there were the shooters from the bridges, years back, I forget where that was.
Really sad that bridges need such huge high fences with the tops rounded to deter both climbers and things such as this.