Nevertheless, signing statements carry no weight of law.
To the contrary. People only consent to what they say they consent to. If the consent is not accepted in context, then the consent is not given.
For example. Suppose a woman says "I agree to the marriage so long as I am not raped."
Then after marriage, the husband rapes her.
Rockr comes along and says "you agreed to the marriage."
Nope. Doesn't work like that. You agreed to what you specified that you agreed to. If you take issue with it, you make it known right then and there that this position is unacceptable.