An anomaly, sure, but they could very well view us as a natural anomaly. We're talking about fiction now and there's plenty of fiction that runs along these lines (aliens view humans as humans view other animals).
> Polluted cities, sucking in value from all around, at the cost of countless species have often been compared to cancer.
Not a great sign when your worldview is exactly the same as the villain in The Matrix...
And Smith was a great villain because we could all see where he was coming from.
No it's not. Anomaly refers to something deviating from some trend or norm. Unnatural means something different.
That assertion is a little bit too confident. Philosophically speaking, can you explain what is different about us creating pollution vs. a tree creating oxygen? Are you saying viruses and cancer are an anomaly or unnatural?
Philosophically speaking, us creating pollution is bad vs a tree creating oxygen because we are killing species at a rate 1000x the background rate. That's objectively bad, extremely fucking bad.
Any philosophy that doesn't recognize mass destruction of life for the sake of temporary individual profit as bad and not normal is _severely_ deficient, to the point of being utterly useless or even harmful.
I don't think that's actually true. Any alien observing the planet over the last 4 billion years would recognize us as an anomaly.
Polluted cities, sucking in value from all around, at the cost of countless species have often been compared to cancer. The aliens might see things similarly, with their large dispassionate eye and tall perspective.