I partially agree with you: European countries other than Germany bear some responsibility for the Holocaust, to an extent greater than what many modern Europeans are willing to admit.
I don't know about Norway specifically, but certainly it's silly when some modern French people claim "well actually, Vichy was an illegal regime, so this wasn't our ancestors' fault at all".
However, whether Norway (as a state) bears responsibility for the Holocaust is a totally separate question from whether Israel's treatment of Palestinians is justifiable, and what the present-day government of Norway should do about it.
I am not saying whether this war is regrettable or isn't and who is more right in this context
I am saying that the term "genocide" that is thrown around very lightly seems to me as an attempt to erase the actual genocide by misappropriating it.
When european governments support this action this has everything to do with their actions in the holocaust and the two millennia of scapegoating jews
essentially what they are saying is, remember the time when we shipped all our citizens of a certain race to the gas chambers for no reason? that is morally equivalent to you fighting a defacto state that slaughtered a thousand of your civilians, raped and kidnapped babies. this is so similar we will actually use the same word for that