So the headline uses the word "pedophiles", but in the article the word is nowhere to be found. Maybe that's because this sting isn't necessarily about pedophiles, but about people watching and trading child pornography. Using "pedophiles" only serves to reinforce the stigma of a already heavily stigmatized minority.
The word "pedophile" should be defined as someone with a sexual attraction towards children. It doesn't describe behavior: people can choose to not act on the attraction, and many, invisible as they are, in fact do not. Also, the people operating and visiting that hidden service could have had other reasons for visiting. They are not necessarily all pedophiles.