Why does this track allow the beating of horses by an assistant starter?

There was an investigation, while the person was suspended. He apparently has worked there about 20 years. Although I don't condone hitting these horses, they weigh 5 to 6 times what the man does. Getting hurt by a horse in as close quarters as a starting gate has to be a real concern from a starter. It was not found to be a routine event.

Im not sure bit something should be done about it.