Re who owns a bulldozer, there are several people in my area who own small bulldozers, but one fellow near me owns a big one. He lives in a wetlands area where no construction is permitted, so I get the impression that he figures that if he does stuff himself that he doesn't need to deal with wetlands regulations. A bulldozer comes in handy up here where there are rocks of all sizes everywhere. If you want land that you can plant a garden in, or even have a lawn area flat enough so you can cut the grass, you really need some kind of heavy equipment to push rocks around. They deepened the ditch along about 200' of my road frontage, and only went down a few feet, but I ended up with a complete stone wall along that road front, made up of rocks that are mostly around 5' diameter, but many are much bigger, one bigger than my car. I bought a small tractor with backhoe to move the small rocks around, but it would be nice to have something bigger.
Re the census, if the guy had responded to the mail form, he wouldn't have gotten a visit, although perhaps there was some building that showed up on a sat pictures that wasn't accounted for. We once got a visit from a census worker who was asking about an outbuilding on a neighbor's property. They were asking whether anyone actually lived there.
I used to be a town selectman here, and the census people came around wanting us to put up a poster inviting people to take the training to be census workers. The people who were interested seemed to be people who like to know about everything that's going on around town (if that makes sense). But they tend to hire people from the area, who are familiar with where buildings are, and they have computers showing where buildings are known to be, and if there is something there that doesn't jive with the computer map they have, I think they have to go check it out. The guy in Alaska probably put up some buildings, figuring that it was nobody else's business what he does, and got annoyed when the census worker was curious. I guess I can see both sides of that lack of agreement.