Full Idea
Natural law theorists fear that by denying the intrinsic connection between law and morality, positivists could encourage the validation of law based on efficiency alone.
Gist of Idea
Natural law theorists fear that without morality, law could be based on efficiency
Source
Jens Zimmermann (Hermeneutics: a very short introduction [2015], 6 'Natural')
Book Reference
Zimmerman,Jens: 'Hermeneutics: very short introduction' [OUP 2015], p.108
A Reaction
The law's the law. The issue can only be whether one can ever be justified in breaking a law, and that isn't a legal question. I am sympathetic to the positiviists.