According to studies done (in the US) on sexual abuse victims the singular thing that most disturbed those victims and left the most lasting damage was the knowledge that there either was or could be photographs of them on the internet. Sometimes the photos could be of them actually being abused or just pictures of them without clothing.
One of the problems for victims was that the knowledge that people would/could be using pictures of them to get their jollies, this was felt to be a continuation of the abuse.
The second problem was that those pictures could be found at a later date by anyone a boyfriend, a co-worker, a family member. THe knowledge that at any time someone from their re-built life may find out, explicitaly, what happened to them was reported as being the number one fear for victims.
Taking a photo does not hurt a child, what can be done with that photo can, actually, ruin a childs life and they may not even know about it until the day someone asks why there is a picture of them on the internet.
I have been in the position of having to wait weeks on end to find out if pictures on a hard drive were pictures of my children, to find out if pictures of my naked children had been circulated to paedophiles across the world. The, very real, thought that my children could have to live with the risk of that hitting them one day made me physically sick and still makes me feel that way. Luckily for me they were not but I cannot feel glad for that because all it means is that someone elses child is being circulated, jerked over, photoshopped to appear to be doing almost anything.
This is not hysteria, this is actual life. Yes it does not happen to everyone however the fact that it could is more than enough for me. I will not take that risk again, I also think other people shouldn't however I would never presume to tell another parent their business in that way.