If you really want to blame someone in particular, it's the first judge who heard the case.
He allowed as "evidence" the word of the teenage girl who had been photographed and whose photo was published without her explicit consent.
She said that "her friends made fun of her" and that therefore, she was owed damages by the photographer.
Everything in this case hangs on that very, very thin thread. If you read the final Canada Supreme Court judgement, you will see that the judges in favor of overruling the original judgement were questioning the validity of the evidence.
Of course, the majority of the judges of the Supreme Court upheld the judgement, because, in their view, the role of higher courts is to sustain the integrity of the judicial system. And there was no specific vice of procedure in the original case.
Dura lex, sed lex. Nevertheless, I wish they had had more balls, and took a risk.