Translation of Schlagzeug

The reason for this behavior may be a reflection of the geographical and geological structure of the state: A lot of high mountains and valleys prevent easy travelling to the neighbors surrounding it.
But we need to asked ourselves why we actually are built in such a way that we so easily dislike others and build stereotypes. What leads to such behavior even in well educated individuals?
We went to eat dinner with the Dutch couple in a Sea food restaurant highly recommended in our Lonely Planet Travel Guide Book. It was OK, but we had a great time with our friends.