I've lived in a country with good social services and one with less good social services. They both have their ups and downs. The problem with social services as a system, is the same problem as with any system: people game it.
I assume in Norway it's no different. Employed feel that the [some] of the unemployed are lazy and taking advantage of the system.
It's worth a mention that this is a common complaint in the UK. We've even had a few government ads run railing against "benefits fraud."
The bad behaviours it encourages: having another child to receive state support, don't look for jobs if you expect to be paid less than the what the govt pays unemployed folks, etc.
Some people take advantage of it. People who don't use it might feel like they're paying for lazy bums. Personally I like to think most people aren't on welfare voluntarily.
I recently read somewhere that Norwegians are some of the most gullible people in the world though. YMMV.
(I think it's a good thing that a country provides welfare to its people like Norway does.)