You are using your own definition of "sane". The Norwegians certainly do not consider him to be "normal", but he might have gotten another kind of punishment if he had been labeled "criminally insane". This is better.
i don't care about the punishment myself. i care more about the image it gives to other nutcases like him.
fact this, this trial went exactly as brevik wanted it to be. he got his chance to speak up and then be declared sane, as he wanted as well. if he had been declared insane, his cause would be more widely perceived a crazy. right now there's a slim chance that far right groups will make a hero out of him in the future, as he wanted as well.
take this guy for example:
"It was obviously wrong what he did, but there was logic to all of it," said Stephen Lennon, the 29-year-old leader of the English Defense League, an anti-Muslim group. "By saying that he was sane, it gives a certain credibility to what he had been saying. And that is, that Islam is a threat to Europe and to the world."