I get the cancer / virus metaphor for humans, we are using the world as a sort of host and our existence does kill of the other organisms at a high rate.
However, we are just another form of nature expressing itself, it is not like humans can make a lasting impression on earth, whatever we do will mostly create a vacuum for future evolution
From a non-human perspective there is nothing inherently evil or wrong about cancer, we conceptualize it as bad because it is contrary to what we value, but that is human values
Not like we know if life itself is a net negative, we assume it is a net good, but humanity being the kiss of death to the planet, which could on net be a good thing.
