That assertion isn’t actually true, in the strong form in which he intends it. Even if you rely on the vagueness of “morals”, it’s certainly not true for legislation.
Bentham is using Enlightenment shorthand; he means “good, just, natural-law-following legislation”. He’s not talking about the actual sausages that we get from real legislatures.
Jeremy Bentham (standing on the shoulders of Joseph Priestley and Cesare Beccaria)
That assertion isn’t actually true, in the strong form in which he intends it. Even if you rely on the vagueness of “morals”, it’s certainly not true for legislation.
Bentham is using Enlightenment shorthand; he means “good, just, natural-law-following legislation”. He’s not talking about the actual sausages that we get from real legislatures.