I know its seemingly random, but seeing this made me think of a specific episode of the show "Its Always Sunny in Philadelphia", where two of the main characters discover that not only was their grandfather a Nazi, but while they were children he bought them to a camp filled with similar minded people in order to start indoctrinating them at a young age.
Just that situation alone made me think for bit while viewing this.
Think about how long ago this was, and how many thousands of these people simply faded into the background while the time passed, hiding their beliefs while sewing seeds of hate among anyone impressionable enough to listen, or perhaps lacking the choice.