In the movie "Schindler's List", why were German children allowed and encouraged to march in front of the German Nazi soldiers during rallies/marches?
Hitler spoke often about the need to prepare German youth for the "movement." Here is a quote from one of his speeches. Eventually, the Hitler Youth program was started, and the indoctrination of young people became a big part of his efforts. I also think that soldiers seeing children marching produces a psychological effect of a desire for protection and a feeling of responsibility, which would help with the soldier's moral for fighting. Here's the quote from https://store.tabblo.com/studio/stories/view/109115/:
"Regardless of whatever we create and do, we shall pass away, but in you, Germany will live on and when nothing is left of us you will have to hold up the banner which some time ago we lifted out of nothingness. (applause) And I know it cannot be otherwise because you are flesh of our flesh, blood of our blood, and your young minds are filled with the same will that dominates us. (applause) You cannot be but united with us. And when the great columns of our movement march victoriously through Germany today I know that you will join these columns." - Hitler
Nazi Germany had an obsession with youth and indoctrinating the young. The "Hitler Youth" were a group of young people devoted to National Socialism and the Nazi party. The children were likely there to show the passion of the young people and to make the parade look better to the audience of families, etc.
Hilter believed that the success of Germany in the future lies in the youth's hands, expecting the children to be:
"The weak must be chiselled away. I want young men and women who can suffer pain. A young German must be as swift as a greyhound, as tough as leather, and as hard as Krupp's steel."
He was obssessed about the notion that the young people could lead the country to greater heights, so he started abolishing other youth movements and asking many young people to join his own movement, indoctrinating the youth to follow his lead, calling his team the "Hilter Youth". They do military activities like marching, grenade throwing, bayonet usage, map reading and many more to prepare for global war lying ahead, to prepare defenses to protect the country. The whole youth contingent was overseen by Balder von Shirach. All these youth movements started growing in numbers until the time when it is widespread in Germany. about 4 million participants in the Hilter movement.