What crimes? Crime is only defined within the context of the in-group. War is rivalry between groups. Killing your neighbor is a crime – killing an enemy soldier is not. The realization that total annihilation is a possibility is more likely to make people think twice about going to war than pretending there are rules to war which protect "innocents". Cheapening the perceived cost of war serves only the warmongers.

I was refering to the holocaust memorial in Berlin. (which already exists among others)
This is very kind of Dr Andreas Nachama, but he might as well ask for a monument of the german soldiers fallen in the Leningrad blockade for example, while he is at it.
Btw, "Nachama" is of hebrew origin, isn't it?