Lots of blame to go around. Clearly they didn’t expect this at all.
IMO the guy went apeshit on a weird target. Interogate and kill him if there’s nothing else.
Maximum penalty possible: 21 years.
I agree this guy CANNOT be allowed to live any longer than it takes to hold his trial.
Even if the death penalty is forbidden in Norway, this guy should be an exception.
I bet Norway has some “Old Traditional Ways” to deal with such lunatics, I suspect they involve sharpened steel.