The only thing I was saying is - just because humans can live everywhere doesn't mean we need to.

If you look at any map of the modern world, there is almost nowhere that we haven't transformed into farmland, cities, etc, and it's pretty good (nice) that we have left the uninhabitable islands to nature. We've consumed most of the land, which is both pretty amazing and also quite bad for biodiversity, as everyone knows.

I'm not debating the "cancer" metaphor which is definitely harsh - it has been catastrophic for other life, but great for us. Maybe that wording can be less harsh, but IMO that's not the point.