The vagueness of porn-related laws and the serious consequences that come as a result of enforcing those laws really makes for a bad combo.
I'm not against the government enforcing laws regarding pornography when those laws are actually clear and well known to the people creating and viewing the material. However, I'd guess that most people view internet porn. And, given the random, "user-uploaded" nature of the material that many sites host, I also wouldn't be surprised if most or all of the porn online is illegal-- for copyright reasons, or because the actresses weren't old enough, or because the actresses were portraying younger people, or because the video is from a country with different laws, etc.
Who keeps track of all that, though? Who knows what the consequences for creating a video that violates "moral standards" are? What about people who view videos from Europe or Japan-- or stumble upon them on streaming sites-- where the age requirements are different? What about hentai-- which seems to be legal and available for sale in nearly every DVD store and which seems to include (albeit drawn) high-school age girls performing sexual acts as a rule-- What are the consequences for people who sell and view that? Are there consequences that are enforced, or does that only happen when the government wants to make an example of some unlucky sap? Frankly, I don't know, and I'm sure most people don't, either. And yet people who most likely don't know what they're doing is wrong get put on sex offender lists and are humiliated in front of their friends and family for this stuff, even when many of these people are a far cry from the true culprits: those who use and exploit and psychologically scar adolescents and children.
This information needs to be made available to people, and the government shouldn't just punish people for things when they've failed completely to draw clear guidelines for the citizenry. I guess to sum it up: regular people going down because they're ignorant of their rights or because what their rights are is too vague is never a good thing, and especially not good for a country that's supposed to value liberty.