The Visitors don't see us as utter animals. If anything, the fact that we have nukes is enough to make them really feel like they have to at least humor us with pretending to see us as equals. However, the Visitors ultimately are not built for prolonged life in space. Yes, they have space stations that are essentially impervious but the constant tick of "what if" never goes away. Nothing in the cosmos matches going outside and just being able to breathe. Not having to worry about carbon count or radiation exposure. Just, being. Not to mention the rugged feeling of being somewhere not completely out of your control but not in it by any stretch either. Every being on a space station is designed. there is no mystery. There is no little quirks. A "little quirk" could kill millions. To put it another way, in a lot of fiction, aliens invade because they want earth's resources but see eveything else as scud. The Visitors, however, are here because of earth's beauty, not in spite of it, in hopes that they may one day be visitors no more. Which is also why humans are in the process of being off worlded. We would have killed the planet and everything on it. This is part of why the Visitors also arent too torn up about off-worlding us to stations or barren worlds. "They seem to like it better that way, anyway."