You’re ignoring all of my comment to focus on one single specific detail, that’s not even important to the overall point.

Because none of what you've said so far is relevant to the overall point. All you've offered are false equivalencies, which is why nobody's taking your argument seriously and why I'm comparing it to cartoonish scenarios, because you've chosen a very comical stance to take on the subject.

A horse stands at 6+ feet tall. Your batteries and luggage are not hoisted 6 feet off the ground when you get on a bus. Also, wheelchairs and mobility scooters literally get tied down and locked in place before the driver can shift back into drive. Y'know, because of the wheels.

I don't know what sort of Final Destination scenario you're imagining that makes it more likely for a 12-inch (generously estimated), 15lb cube on the floor to be jettisoned at the precise angle to be more dangerous than 1000lb of unsecured horse meat that occupies 2/3 of the breadth of the bus and is already standing at the optimal human-crushing height. One of those requires many stars to align in order to happen, and the other just requires that a horse is on the bus at the time of the incident.

Besides, it still doesn't matter because the horse, itself, is the threat. It doesn't require an outside force to act upon it for it to be dangerous. It just has to get spooked by a falling leaf for it to kick somebody's head clean off, or get sleepy and decide Grandma's now-ragdolled body is a great napping spot. The vehicle never even has to be in motion for the horses' presence to be a hazard.

Jesus, this is stupid.