I knew there probably would be, from someone, and I knew that the age of the cyclists would also loom large for some people. If you'll notice, neither race not age were mentioned in the original post and that was deliberate. Part of the point.
Whenever we see ourselves thinking along those lines - bunch of rowdy kids for example - we should take a moment and imagine if it was me. Imagine if they were my kids, or my whole family. Does that change the perspective on what happened?
If it does then something is wrong and we should address in ourselves before upbraiding anyone else. Because in that case, our reasoning and viewpoint will almost certainly be flawed. If nothing else, that becomes embarrassing.