Before we rise to the defense of the official representatives of an oppressive and totalitarian regime, let's remember that they weren't shot, they just had to find another place to sleep. Ouch. If the outrage they suffered left a mark, it's more likely from bad mattresses at the Reindeer Inn than from the jackboots of American diplomacy.
The U.S. boycott has been ineffective and continuing it is nothing more than a self-perpetuating exercise in futility. We can be stupid that way. A large part of the reason it has been ineffective, however, lies in the fact that so many governments (and people) care less about the trampling the Cubans are enduring at the hands of Castro and his band of delusional antiquarian socialists than they do about the opportunity to tweak the Americans while making a few krone. Or loonies.
My suggestion to the Norwegians? Relax and wait it out. You'd like to sell the Cubans some oil but all they have to pay with is a little sugar and some beaches. Give it a couple of years and the US embargo will be over - Castro will be writhing in Hell, his brother will retire to one of the few remaining Workers Paradises (Caracas? Managua? Harare?) and the gringos will be back on the island in force, led by hundreds of thousands of expat Cubanos that have been biding their time in South Florida. We speak the language, know the culture, and have the money to buy the sugar fields and turn them into golf courses and condos. Ten or fifteen years from now Castro will be nothing but a scary memory to frighten little children with and Cuba will be a first class tourist destination, with a real economy and the attending thirst for oil - that's the big payday for Norway.
The best part of all this will come when the Canadians and Europeans that have spent their vacations commiserating with the proletariat while ignoring the fact that their fun in the sun wouldn't be possible if it weren't for the slaves laboring on their behalf have to start looking for a new place that the Americans haven't overrun. Good luck!
To our friends in Norway (and Japan) who are upset about this, let me make this suggestion: rather than being mad at us for treating bad people with disdain, maybe you could do something important - like mustering the willpower to stop killing the whales!