It is not always enough. Like for example my ex sister in law once held the door open for the burglar who were getting out of the building with her own TV. She only realized that when she went upstairs and found her door open.
Doesn't this actually support the argument? If she had known her neighbors she maybe would have questioned this stranger carrying out a TV, or at least given notice to their appearance.
It is quite common to seek help from friends when moving in and out, it could be the result of a sale in the second hand market, etc. I don't think knowing your neighbours is enough. The burglars were quite polite and I have to clarify it happened in Switzerland where most people don't necessarily assume malice by default. Not a country where you risk being shot for stepping in a property.
Didn't that happen in the 1st Spiderman movie, except the robber killed Uncle Ben...