Why was it difficult for non-Jewish civilians to help, hide, or protect their Jewish neighbors?

It was difficult because the Nazi Leader Adolph Hitler warned the Non-Jews against rescuing the Jews in his communique which is shown below:

This is a categorical warning to the non-Jewish population against Providing shelter to Jews, Supplying them with Food, Selling them Foodstuffs. He further stressed that a violation of the laid down rules was punishable by death which made the non-Jews afraid to do so.

the process is called revolution because it was a process of great economic-social transformations that began in england in the xviii century.

the industrial mode of production spread throughout much of the northern hemisphere throughout the xix and early xx centuries.

the effect of this revolution was the distance between the countries, with respect to economic and political power.   after all, not all industrialized at the same time, remaining in the condition of suppliers of raw materials and agricultural products to the industrialized countries.

these differences mark to this day the nations of the world that are divided between developed and developing countries. one way to measure whether a country is advanced is to assess how industrialized it is.