>when there's transience and anonymity, there's a high incentive for people to behave poorly
Sometimes people tend to behave even more poorly if there is no anonymity. This happens when they think that they are morally right in an important area although they are totally wrong. Many racist "this needs to be said" comments are written using real names.
in most suburban places you can also leave the garage door open all day long just fine.
it's primarily dense cities that are the issue. just like online, when there's transience and anonymity, there's a high incentive for people to behave poorly.