Sorry, I understand your passion, but you are simply mistaken.
Do QBs today get hit? You betcha. Thing is years ago, tackler did not have to hold up or think to not hit to high or hit too low. QBs were hit just as hard as any other player on the team.
Just ask Joe Namath about his knees.
Another thing is the equipment players wore was no where near as sophisticated as they are equipted today.
You really can't compare the players between eras. (NO matter how adamant you are about it).