jurbasGermans still do ;)
That would be like asking the German or Japanese people of today to pay for the mistakes made in World War II.
As for the Japanese... well, they really should be. They never compensated countries like China, the Philippines, Korea, Malaysia etc for what they did to them during the war because the US insulated them from it. It's a wound that still burns hot with China because it's never been resolved. :(
That's what it's about man: a gesture of atonement.
It's less like you paying for your dad's bulling ways and more like familys settling old differences to get rid of long running feuds that sill harm relations between them :)