The rules surrounding targeting were put in place to protect players. In 2013, the rules were amended to cover ejections regarding targeting. 

RULES

Targeting and Initiating Contact With the Crown of the Helmet  (Rule 9-1-3)

No player shall target and initiate contact against an opponent with the crown (top) of his helmet. When in question, it is a foul.

Targeting and Initiating Contact to Head or Neck Area of a Defenseless Player  (Rule 9-1-4)

No player shall target and initiate contact to the head or neck area of a defenseless opponent with the helmet, forearm, fist, elbow or shoulder. When in question, it is a foul.  (Rule 2-27-14)

Note: Beginning in 2013, ejection from the game is a part of the penalty for violation of both Rule 9-1-3 and Rule 9-1-4.

Note: Edited to remove faulty analysis.