What is signifcant abou the three colors - red,white and black - that resonate with Death when Death remembers Liesel?

Death explains that these three colors -- red, white, black -- most resonate with its memories of Liesel, and draws them on the page as a dash of red, a circle of white, and a swastika for black. These are the colors and symbols of the Nazi flag; the implication is that Nazism is responsible for the deaths in these three episodes.