We should not forget that world war 2 happens, but it also doesn't make much sense for Germans to continue self-flagellation forever. If anything, the lessons learned by the period between world war 1 and world war 2 is that lasting peace is not about trying to fix every past injustice by never ending reparations. It is not feasible to create a world as if world war 2 did not occur, and at some point people has to accept the past and work as a single group, like say a European union rather than Europe vs Germans.