Translation of Überzeugung

Although I put my wallet in the front pocket of my pants it was not there. I had been so diverted by the aggressiveness of these kids that I did not feel it when they grabbed it out of my pocket.
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?
I spoke to my sister's friend and she told me I could stay at her place whenever I wanted. I then played Galaga on one of the computer machines and advanced to a very high level of the game.