Sorry to bring you this news, but you are completely wrong. The strict gun laws in Norway is not what made Breivik what he became.
By your logic, any one of us would nuke the world, if we could steal a nuke? I dont think so.. Sure, some guys are either so crazy or they have so strong and violent political views that they might do it.
However, it is not that you cant buy a nuke that makes you want to nuke the world. I do not want to nuke the world!
The same goes for guns.. Why do you need them, if you are not hunting deer or some other animals? What is the point of gun clubs / firing ranges?
I know some people will think: it's cool to shoot guns, but hello... Someone needs to do something and something serious! There is no reason that you should be able to buy a weapon.. Yes, it is a weapon.
It is made for one single purpose. You do not need it to bake or to fix your car, you dont need it to slice your bread! You dont really need it at all.
You can say that guns dont kill people, people kill people.. But at the end of the day, it's much easier for people to kill people, if they have killing machines. Why should they be able to get killing machines in the first place? If they cant get it, they will be easier to stop and impulse actions may not happend at all!