Why the sensitivity on the German side then?
The first world war is a century old and the second world war is now approaching three quarters of a century old. When I first moved to Germany I lived in the town which was renowned for its baths and accordingly was a place for the evolution of hospitals and rehabilitation centers. In 1989 the streets of this town were filled with men with white hair and one arm or one leg, veterans of World War II who were lucky enough to have survived. Today, these veterans are no longer to be seen on the streets of this town, virtually all of them having died out.
I tutor kids to help them pass their English and history exams and so they are anywhere from 17 to 20 years of age and their universal reply to whether they feel "guilt" for World War II, or for the Holocaust, is to observe that they were not even alive at that time. They feel no such guilt.
Likewise, I feel no guilt for slavery. Do you?