NFL head to head rules

The new rules that were put into place over the last couple of weeks as a result of an increase in concussions have many players questioning the integrity of the new rules.  Many defensive players believe that this is giving the offense an advantage.  The reason for the rule is to simply limit the amount of injuries to defensless receivers running routes over the middle of the field. The rule does not lmit the fact that players can stil lay big hits, only ines with direct helmet to helmet collisions.  I agree with the idea of the rule but i dont think that the NFL can limit what is almost a natural reaction among many players when a hard collision is inevitable.