Germans seek out lively discussions. And lively are those involving clear differences of opinion. And the more complex and relevant the topic, all the more interesting the conversation.
Except for topics which are plainly too personal and sensitive, Germans are willing to address almost any controversial topic. They enjoy the intellectual give and take. Controversial discussions are a form of mental chess.
At a deeper level Germans want to demonstrate that they are well informed, are proud of their high level of education, want to show a broad world view, that they are anything but provincial. Most importantly, Germans want people to know that they think independently, critically, do not simply agree with the masses.