When law enforcement investigates the world of child pornography, in which area do you think they spend the most time: investigating those who create these horrendous images or tracking down those who view them? I would bet that most of their arrests are of those who download images. Easy to find those guys, easy to get them to confess, easy to get them to plead guilty to a felony. Much harder to identify the children in the images and to identify the people who took the pictures or shot the video. Not to worry, though. Law enforcement will get plenty of credit for arresting those who look at the images.
People who see the images and know the children are unlikely to call the cops. After all, a conversation that begins with "I was looking at child porn" is likely to end up with the arrest of the caller, even if the caller completes the sentence with, "...and I can identify the children."
Fortunately for the world, law enforcement can look at child porn all the time because they are the good guys, right? How else would they be able to save the children in those images?
And if they aren't looking at child porn to identify the children and the perpetrators, how do they think they will be able to protect those kids?
So we have law enforcement paid to look at child porn arresting people who look at child porn for free. Crazy world.