I think it safe to presume everyone is concerned about illegal helmet to helmet contact, and is prepared to deal with it. However, not all helmet to helmet contact is illegal, nor intentional, nor avoidable. Such contact involves a collision between two, usually opposing, charges by quickly moving players and aside from illegal contacts, which by definition involve targeting or can be deemed reckless, can be the unintended responsibility of EITHER player.
Certain techniques are considerably more likely to produce problematic collisions, and should not be taught or encouraged. Consequences such techniques earn, even when unintentional, are justified because of their inherent higher risk. However when helmet to helmet contact is the result of sudden, uninentional movement by either player, neither deserves or has earned penalty.
There is a fine line, we each have to deal with that challenges our judgment and requires a keen understanding of the relevant rules