@maporsche,
That's reasonable in terms of very specific circumstances: Like your example of uncovering stolen artwork.
The issue is that so-called "Far Right" political parties (or maybe just one) in Germany don't believe that the nation is required to "atone" for Nazi crimes in perpetuity.
Unless one is a firm believer in the Biblical tenet that the sins of the father pass on to the son, at some point "atonement" by future generations should end.
For instance, there is no one alive today who owned slaves. As horrible an institution as it was (and arguably it is right up there with murder), for how long are the ancestors of slaveholders required to "atone" for the sin?
This doesn't even address the fact that the vast majority of Americans had absolutely nothing to do with slavery and a great many of them have ancestors who fought against it, and died or were maimed in the process.
Blatham and some of his fellow progressives don't ever want to surrender the clubs they have so happily used against their opponents, and therefore believe the answer is "For All Time!"