No I don't think so. Freedom of speech. Blah blah blah. How about good parenting? That should be focused on 1st an formost. And by the way kids have always looked at porn. Somebody knew somebody who's dad had them around relatively available. I remember my grandpa keep nudie magazines under the mattress in the guest bedroom. I was certainly when I discovered that one summer.
Protecting the rights of citizens IS moral convention. Morality is nothing more than the idea that your rights stop where the victimization of another's rights begin. Social convention governs the boundries of these rights. Law is essentialy social convention based onthe idea that your rights stop where the victimization of another's rights begin - morality.