Because Norwegians have an independent foreign policy of that of the EU and US, and they are a credible source to the whole world (apart from israel), and Norwegians don't lie. They will report what they see and this terrifies israel. When israel declares another country as being hostile towards it, then that country must be doing something right.
Wreckage found on Reunion island triggers speculation over missing MH370 (DPA)
from the article: Lieberman: Norway too 'hostile' to have monitors in Hebron