I think (especially young) people in Germany should recognize the dark era in their history no longer just as a burden and an unpleasent memory of the horror carried out in the name of the country they were accidently born into and they identify with. But rather they should start to realize that this burden can be transformed into the chance to be more aware of the tendencies to maltreatment of fundamental human rights both around the world and down the street.

I don´t think that guilt and responsibility equals, but for me guilt is a personal issue. I do feel guilty if I personally did something wrong. So - for the fact that I wasn´t born yet - I´m definitively not guilty in bringing any input to the crimes committed to the Jews by Germans that time.
But as a German I do feel the responsibility of being aware of my country´s history. Though I don´t feel bad or guilty in that sense I accept history and try to learn from it. Basically, what history with reference to the Holocaust discloses to me is the fact, that "civilized humans" can turn into mere evil under certain circumstances. And that´s what I believe is the most important aspect to keep in mind: There´s no such thing as philanthropy if it comes to the socially accepted dismissal of any cultural, religious or legal constraint of the "beast" in the human nature. But that´s off topic.

In my opinion the figures indicating Germans not to have a big deal of stake in defending Israel if it comes to war are not of great substance to the question of German-Israeli relationship. If at all, the number could deliver some information if compared to the results of the same question asked regarding other countries: How many Germans would be willing to defend the U.S. in case of war?
There are so many other inputs in one´s attitude concerning participating in a war that a single conclusion like "Germans don´t care about Israel" is far too simplifying.

I had the chance of meeting people from many countries and discussed the "German issue" quite a few times. Fortunately I can say that in the present-day generation there´s no real cleavage along countries or nations but rather along the educational level of the people.
Simple people believe in simple answers. Thinking in categories of black and white makes the overwhelming and difficult reality rather manageable even if completely wrong.
The first idea of Germany from people all over the world often is associated with Hitler and Nazism. To get rid of that Germans must be very clear that it´s not their fault and in my opinion that´s the reason for the growing attitude of Germans not to be bothered by the crimes of the Nazis any more.
Unfortunately the same argument is raised in order to forget about the whole period.
I hope and believe that Germans in the future don´t feel personally offended or bothered any more when the talk comes to Nazis and the moral heritage of Germany today but rather accept it as a part of history which impact will be important far into the future. The chance of recurrence of such a horror by whatsoever means would be far more likely if it wouldn´t be kept in mind.
So, to put it succinctly: don´t feel guilty but take the responsibility in reminding what Germans did during the Nazi regime and what humans are capable of doing everywhere.