All this stuff dates back to the times europe was besieged by muslim forces.
Christian european peoples imagined there was a powerful and rich african black christian kingdom warring against the muslim forces, a kingdom which was being victorious and soon would come to relieve them from the muslim danger. A kind of second front.
Democratically speaking, it is funny because nowadays the black ones are considered more like pollutants than saviours.

The saddest part in the story of the democratic german soldier is that he might have the victim of a vengeance scheme.

Either it was the first time he did this and then a warning should work or another sanction. Either it was not. In the last case, how come that his democratic superiors, who did not discipline without the event aired on the internet, are not sanctioned too? They might have covered up the stuff as well.
What other grunts who were instructed the very same stuff? Why did they not report before?

Sounds like this democratic sergeant is playing the part of scape goat in this story. Many others might be as well involved.