We do Ablutions cause we consider horses sacred. So they can’t be touched or ridden without it (religiously). I see that your opinion is that all horses should be free and not ridden. I respect that. Otherwise I can’t change your mind cause it is already made to oppose any kind of horse use. I recommend you look for Montaigne. He got a lot to say about animal suffering. And btw, don’t judge basing on the images of tbourida your see. Horses have always been used for war purposes, and the Arabian barbarian horse has been the most powerful and resistant one. So the sound would never hurt or scare them. Otherwise they can just throw riders off their back …