This quote seems very telling: > It used to be that only locals knew all the cut-through routes, but Google Maps and Waze are letting everyone know So they don't have a problem with people cutting through as long as they're "locals"; it's when the outgroup starts doing the same thing that people get up in arms. If the through traffic is breaking traffic laws, that's a solvable problem. If the street has insufficient…
That's one (particularly dramatic) way of looking at it. You could also interpret it to mean that it's just about the overall number of people making use of the routes. Adding in non-locals might just push that number over a certain threshold.