C'mon, Libertarians aren't wiser than Madison. Even arguing that they're wiser than Pee Wee Herman would be a stretch.
Libertarians learned from Madison and Jefferson that every power needed to have a check. This is the basic design of our constitutional order.
The juries right to nullify bad law (stupid,unconstitutional, unfair) is just that "check" thing against the power of the legislature. Jury trial was assiduously preserved in the constitution for just that reason. It was their intention that juries should enforce the constitution, to determine what laws were unconstitutional and check the legislative branch (Federal or state).
The judiciary took the job on for itself in an 1803 case but that did not eliminate the juries right to do likewise.