Also, guns aren't illegal in Norway, there are 31 per 100 inhabitants.
Gun violence is a 45x bigger threat in the US which explains at least some of the disparity.
https://en.wikipedia.org/wiki/List_of_killings_by_law_enforc...
But your 16x figure from Wikipedia is also not accurate -- it overestimates the Norwegian rate by about a factor of 7 for some reason. Using the historical data at the bottom of the page suggests that the rate of police killing in the US is around 60x higher than Norway, or 150x if we assume that there were no killings in Norway between 2017 and now. This is considerably greater than the 10x difference in homicide rate (you quoted that as 45x but as I said previously that is for gun homicide only, and you haven't given any reason why that is more relevant).
This is my point. The data needs to be understood and contextualised before we form conclusions as to why the disparity exists.
As for the reason to focus on gun homicide: in 93% of cases where US police use deadly force the suspect is armed with a weapon[0]. This extremely high prevalence of lethal weapons, and the immediate threat to life it implies, almost certainly contributes to the high number of police shootings.
This threat simply doesn't exist in other countries, where even if there may be a high level of gun ownership, gun use is restricted and citizens are predominantly unarmed.
https://www.washingtonpost.com/investigations/fatal-police-s...
Have you seen the homicide rate in America? You cannot quell that level of violence with hugs.
Police in the US operate in an environment where every person they encounter may have the means to kill them within seconds. This is not to ignore police brutality, but these details matter.
To compare the situation to a tiny homogeneous country where guns are illegal is silly.