Sometimes, it's a little too easy to see the Law as the problem. As Paul continues his teaching in Romans 7, he wants to make it abundantly clear that the Law is not the enemy to overcome - sin is the problem. Unfortunately, sin is so pervasive and powerful, that it can even twist the Law (a gift given by God to Israel) into something evil. A hammer is good for pounding nails. A hammer used to pound someone's head is bad. So it goes with the Law. If we remember that the actual enemy is sin, we can recognize that it is the Spirit of Christ, not following the letter of the Law, that conquers the true enemy.