Eg the "cars are evil" crowd sill say something like "oh they built another lane from the burbs into the city, but traffic is still slow because more people now moved from the city into the burbs and are driving in that lane."
You never hear them say, though "I guess that means there was demand for people to move out to the burbs for greater space/safety/quality of life." So even if dad now gets a longer commute, he's clearly choosing to do that because his family overall is better off. To the extent that building the extra lane enabled this, the world is better off even if eventually that lane itself is as saturated as the existing ones.