First, Breivik's acts in Norway were terrorism. Don't pretend that because he's Norwegian he wasn't trying to use fear and violence to cause political change.
Second, I'm sorry, but as an American who currently lives in Oslo (and was at work 2 blocks from where the bomb exploded last year), the comparison to how America has reacted to terrorism compared to how Norway reacted to this event is entirely fair.
Immediately after the bombing, nobody knew who was responsible, but many people immediately started theorizing that it must have been Muslim extremists (Norway is active in the international community, and not everyone is happy with them based on their attempts to help with negotiations between Israel/Palestine, opposing forces in Sri Lanka, and not to mention their ongoing attempts to figure out what to do with Mullah Krekar).
After the attacks, the government could very easily have made changes to the law and done so very quickly (look at how the U.S. was able to pass the horrible Patriot Act in less than a month after 9/11). Instead they had a very reasoned response. --The army was deployed to several locations around Oslo for two days (to help keep people out of areas with heavy damage after the bomb, around their parliament, palace, and a few other locations), and then they were gone. Very few new laws have been introduced - the only big one is the one to allow them to hold Breivik in prison even if he is declared insane, although they're now considering laws to allow more internet monitoring, which I hope will not pass.
In comparison, the U.S. reaction to 9/11 (which resulted in fewer deaths and injuries per capita than in Norway) include the Patriot Act, the Department of Homeland Security, and military tribunals where defendants and their legal counsel aren't even allowed to see the evidence against them.
I had a lot of friends and relatives asking me if I wanted to move back to the States after the attack, and I've always been able to point to the reasonable response Norway had to a horrific attack vs how the U.S. responded and easily say no.