Well, I must admit it is a good question, which has a potential to grow into a wild discussion. As for me, I believe, the title is fine. People die from disease and old age all the time, but we don’t build memorials because of that. The other thing about people, whose life was taken away by other people, no matter what the reasons were standing behind the action (racism, hate, jealousy,...). If the act was conscious and, moreover, took not only one life, but hundreds and thousands, this is something to think about. This is history we should never forget and never let happen again. Therefore we need a memorial. To have a constant reminder of the awful things happened, to have an act of begging for forgiveness, to have a place, which would keep us away from doing something similar again. Of course, concentration camps were a wrong way to go. Still, if a person wasn’t murdered, but died in a ‘natural’ way (so to say), how can you take responsibility for that? Probably the only problem would be keeping this person imprisoned, but this is an entirely different issue. Wouldn’t it be unfair to murdered people if we blend their grief of losing life with a sadness of dying from old age?
Still, this is only my humble opinion. I hope other people will express their thoughts regarding this issue. Thanks for asking, it made me think a lot about it.