I think it has something to do with crime rates. Due to a very weird way in which the police report crimes any crime that they don’t have the exact location for, they just default to the police station which is just down the road from me so as a result my area is apparently extremely high in crime (it isn’t). I think Amazon do it based on whether or not they think people are going to steal the package and they figure a high crime area is an area where package theft is common.