you can also have a chance of being killed by having some nutter kung fu kick you in the face with football boots on, or kicking a football boot into your face. fergie claims that this could have killed him and was worse thing to happen on a pitch for years and years, yet he happily kicked a boot into one of his players face, which caused more damage, and wasnt far away from blinding beckham then a ball to the head.
if there is a chance a ball to the head could kill, then take heading out of football and introduce a rule saying the ball isnt allowed above shoulder height.