Another horse has died at the Melbourne Cup meeting?
Look, I think it clear that they're just not trying hard enough to be careful where they put their feet.
You can't expect a horse to understand the consequences of carelessness without a demonstration.
Therefore, I suggest that before the start of each race, when they are all at the barrier, a bit of theatre needs to be performed: a two person pantomime horse races onto the track, feet all over the place, and stumbles and falls. A guy in an overcoat rushes out and pulls out a fake rifle and shoots the stupid panto horse, shouting loudly all the time, like Basil Faulty attacking his car with a stick. If that's not enough, someone can fake chainsaw the "horse" in two, and other assistants drag away the two halves by the feet.
Race track cleared, the event can begin.
You know it makes sense.
[Now that I think of it, I fear that Roy and HG may have already proposed this, many years ago. My apologies if that's the case.]