It's tough to characterize any group in particular as bystanders when so much of the world was involved in the conflict.
It cannot be denied that 'ordinary' people in Germany were powerless to oppose the Nazis treatment of their opponents. That was because the Nazis made it that way: Political Opposition wasn't an option. Indeed Political Opposition simply made you into a victim. Therefore to be a bystander was a means of survival, doing & saying nothing kept you alive. By the same token joining with the Nazis was seen as the only way to prosper.
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Nevertheless, some ordinary Germans did in fact help victims and people in danger, but it took a lot of courage and they had to set about it very cleverly. One can argue that in some Nazi-occupied countries the position was somewhat different, especially where there was a broadly based, popular resistance movement.
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In the context of the Holocaust bystanders were people who were neither victims nor perpetrators but stood by, watched and did nothing. Obvious examples include Germans who knew that local Jews were being deported for what was called "resettlement in Eastern Europe", Poles who knew what was going on and so on.
Considering most of the world were bystanders to the Holocaust, this would excuse the actions of those who perpetrated the Holocaust and those who enabled it. So no, you cannot say that they were.
what was the percentage of bystanders who did what? percent is a measure of proportion, there needs to be another reference point. do you mean of the world's population? do you mean only of those involved in the Holocaust? but then you say World War II, so do you mean 'which countries were neutral in World War II?' the question is impossible to answer as it is.
In Germany and surrounding countries Jews had no rights and at the very best of times they had severely limited rights. Before being thrown into concentration camps Jews were put into ghettos, had a curfew, and could only shop at Jewish stores, amongst other things.
A huge event like the holocaust is not easily forgotten, and by remembering this horrific event we learn to not repeat it. Even though there is still genocide occurring to this day...
With respect, this is a very puzzling question. It implies that the period before the Holocaust was some kind of 'age of innocence', which was certainly not the case.