While an Investigation and the threat of a prosecution wasn't a nice experince for Col. Klein, I think it was a legal necessity. Finally there is at least some legal certainty. Hopefully this will encourage the german Army to act resolute in battle and disperse the notion that german soldiers are under the threat of prosecution for every warlike action. Still, the bombing itself shouldn't be taken as an example on how to conduct operations.
So at least the legal aspect has become far clearer - this will be very welcome news indeed for the German soldiers in Afghanistan. The question of the political will remains, but this should not take away from this very important ruling.