How can you explain the mass heroism of the Soviet people during the war?

The mass heroism of people during the Second World War can be associated with the fact that the people wanted to drive the invader from their land. In addition, do not forget about the brutal massacres of the civilian population, which were committed by the units of the Gestapo and the SS. This angered people greatly, which was the reason for such a fierce struggle. In Europe, there were no such phenomena, why the people more calmly accepted the occupation by Germany.