When they are at Arthur Dents house the government had to destroy it to build a bypass. A little later on aliens come because they have to destroy Earth to build a bypass. This is good because once you notice the pattern you know that every place will serve a purpose in some way shape or form. The weakness is that if a setting does not serve a purpose then readers will interpret it in a certain way when really it’s just a place. The setting choice being important is kind of like how it is important in Greek Mythology. We need to know where gods are because it sometimes defines them for example Zeus is in the sky at Olympus and when he gets mad the sky turns dark and thunder and lightning