<span>the dominant social system in medieval Europe, in which the nobility held lands from the Crown in exchange for military service, and vassals were in turn tenants of the nobles, while the peasants (villeins or serfs) were obliged to live on their lord's land and give him homage, labor, and a share of the produce, notionally in exchange for military protection.</span>
Both are correct its all about who is living there and where it is. In lower income places where people dont have alot of money they tend to turn to stealing for money/food. Crime is everywhere and it can tend to be worse when you have a bad neighborhood.