Of course, no one ever tells you to shoot "that nice fellow countryman over there". Soldiers are told dangerous (though unarmed) anarchists/bourgeoisie/terrorists need to be stopped. And the vast majority of cases end up with a lot of dead civilians.
I am not judging, I would likely be the same if I were a soldier in that situation. The fact it happens so often shows it isn't down to individual soldiers lacking some moral or ethical quality. It's human nature. It's why armies work. I just think everyone have a (very dangerous, baseless) belief that "that could never happen here "...
You've only been able to list 1 example in Norway/Sweden. I gave 3 off of the top of my head across a range of times, countries, cultures etc.
You can "believe" what you want. But the facts are against you here I'm afraid...