Earlier quoted context omitted.
Nice imagery, but feels like a bit of a put down of humanity. Humans are also nature, let's not leave ourselves out. https://youtu.be/mTEUrdKehSg
It is really an anti-war poem rather than anti-humanity or about nature in general. Sara Teasdale was forced to write her sentiments obliquely. From Wikipedia: > "The Sedition Act of 1918 enacted two months before the original publication of "There Will Come Soft Rains" made it a criminal offense to "willfully utter, print, write, or publish any disloyal, profane, scurrilous, or abusive language about the form of the…
And yet there are humans that treat animals well (e.g. dogs, cats, crows and so on... ) These animals would feel the loss if humans disappeared. So i don't think it's right to say that nature (animals) wouldn't care and that the sentiment is a bit of implied put down of animals capacity for emotion and caring. Animals can care about their own and across species. Humanity would do well to feel less disjoint and separate from other humans and animals. That alone would reduce conflict a great amount and highlight the good that can be done between humans and animals.
As you probably noticed, I'm not fond of making a big distinction between humans and animals or nature. Hope that gives another perspective, and yeah, she probably was against the war and upset about the way humans were behaving at the time.