Density saves nature

This is true. In Holland we have laws and regulations about this. My wife's job is enforcing this, although most of the work is designing places to minimize problems (don't build homes right next to highways, or under flight paths, or next to industry), as well as dealing with cafe owners who let their customers talk in front of the bars smoking at 02:00. 😄

that's true in SFH suburbs too, you don't magically get to launch rockets in your backyard at midnight.