Romans 7:7-13

I'm struck by how Paul writes about the law being a good thing. It sounds to me kind of like a spiritual vaccination. I'm not sure how doctors figured out that if you put a little bit of something like polio into the body you could become immune to polio. Somehow, by pointing out this wretched disease your body is able to recognize it and therefore fight it properly. Paul seems to be suggesting something similar here, I think. By introducing the law into your life you are made aware of the sin that is present and you are better able to confront it. So in a way, I guess, the law allows us, or helps us, to live in God's grace. Now that sounds like a good thing.

What do you make of what Paul is saying here in Romans 7?