Without reviewing the pictures (which I am not able to and have no wish to), I could not pass a judgement on Sorblade, but on desert, I think that there should not be a question.
The intent of his post and the context was VERY obvious. If my memory serves me correctly, there was a picture with a little girl holding two metals bars on a window behind her head, and sitting with legs spread out, a little girl in a school girl costume, two or three other little girls in 'provocative' positions. When you are talking about children, I think that intent and context is everything. The intent here could not have been clearer. Personally, I would not consider it any differently than if he posted pictures of fully naked children. I know what a naked child looks like, cause I used to be a child, and when I was very young I used to play naked with my friends out by the garden hose. :P What matters is context and intent. There is nothing wrong with a mother washing her naked child, but there is when someone is looking at pictures of naked children for sexual reasons. IMO, sexualizing clothed children is just as disgusting, and really no different. What is bad (as Lemur tried to point out I think) isn't naked children, it is sexualization of children, naked or not. That is what desert was doing, and I think he is completely deserving of a lot more than a ban from an internet forum.