You have to take the long view. First, when Moses came down from Mt. Sinai, man has already progressed to the point where a commandment against cannibalism was no longer necessary. And, second, it's like pissing on a boulder. For the first few thousand years, you don't see any effect. But after that, you start to see a definite impact.
I. F. StoneEvery emancipation has in it the seeds of a new slavery, and every truth easily becomes a lie.
I. F. Stone