Translation of beliebig

He also told me that he had build his scooter by himself. I could not understand how a doctor was able to build such a machine on his own. It seems that the circumstances made people capable of many things.
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?
On the way we met a nice village girl which tried to sell us some souvenirs. We told her that we would not buy from her. Her English was excellent, and we did not believe that she was twelve years old.