They are not separate concepts. If Congress were to enact a law correcting an injustice, they would get the power to do this from the Commerce Clause. This is referred to by Madison in his letter as a power used for the "positive purposes of the General Government".
Where do you think Congress gets the power to correct injustices? Do they even have that power? In your opinion, how does Madison refer to that power in his letter -- as a "preventative provision? C'mon.
Once again, you are corrupting the meaning of "rather than". When Madison says, "rather than for the positive purposes...", it means the power to RCATSS was not to be used for the "positive purposes..."
Where do you think Congress gets the power to correct injustices? Do they even have that power? In your opinion, how does Madison refer to that power in his letter -- as a "preventative provision?
Exactly. The power to RCATSS "was intended as a negative and preventive provision...":
Class V. Words Releasing to the Voluntary Powers
637. Provision.
--Roget's International Thesaurus. 1922.
If they are not separate concepts, then it is nonsensical to talk about one, "rather than" the other.