Criminalizing an intrinsic evil like pornography is "social engineering"? Do all laws represent "social engineering? What are laws for but to prevent evil and punish evildoers?
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Pornography was universally criminalized in our country until the '50s, as far as I know.
Well, here's the rub: pornography isn't evil (intrinsic or not) nor is it illegal. As a matter of fact, it is generally protected as a form of free speech.
You say it's evil, I say it isn't. I at least have the law on my side of the argument.