Agreed. I understand where blacklion is coming from. I have been in the schools where the instructor wants to dump you on your *** all the time just to show how hard he can hit. I have also been in the schools where the instructor and students will dump each other from time to time so that your not dealing with the fear/anxiety/pain for the first time in a life or death situation. You should have a good idea as to your pain tolrance and how you deal before you do it for real.
As my instructor always says "I'll hurt you, but I will never harm you." The hurts are necessary lessons.
On sport bikes, I often tell people they need to learn and practice riding with a degree of fear, otherwise the first time you get scared in a corner you wont know how to deal... chop the throttle, hit the brakes and the bike stands up and poof... off the side of the road an dead.