In the hierarchy of road hatred, loud motorcycles are by far the most hated by all others (cars, pedestrians, cyclists, etc). Happy to hear there's no science/safety reason to encourage loud motorcycles.
But you are right. I can't recall the time anyone rolled coal on motorcyclists, much less killed them trying.
In that vein, the hate for drivers should then be a hundredfold. How many haven't lost a dear one to a car driver?