You have a point. At one time whitehouse.com was a hard core porn site. Many people confused it with whitehouse.org, and they accidentally got downloaded porn.
There is a difference between hardcore porn, which is perfectly legal, and kiddie porn where it will get a prison sentence.
We'd like to think so but that's not always the case.
Melissa Ashley (wikipedia link SFW)
People have been charged with having possession of child porn when the model in question was actually an adult. In these cases, the charges were dropped or acquitted only because the actress herself took time out of her life to show up at the trials of the accused and testify for the defense.
These are cases that actually went to trial. Are there others where the accused was given an offer he couldn't refuse in exchange for a guilty plea? Other cases featuring young-looking adult actresses whose real identities couldn't be discerned and/or couldn't be located to testify? Who knows.
Please don't get me wrong. I'm not defending child porn. But seeing people get charged when no crime was ever committed troubles me, --as it should trouble those who fight against the real and legitimate crime of child pornography.