While there are some germans alive who were Nazis. WWII ended 70 years ago. Someone who was 18 in 1945 would be 88 today. You cant really expect an 18 year old to understand everything. Someone who was 30 in 1945 who would have understood would be 100 today.
Unfortunatly Leipzig was a little differnt because it was in East Germany and many of their reperations did not start happening until the Berlin wall fell. They have only begun recently paying them because of communism