But we are a part of nature as well, and have no choice but to interact with it. There is no such thing as a perfect ecosystem equilibrium (If only because of entropy), life is constantly evolving, whether there are humans involved or not.

I understand your point and frustration though, as striving to preserve diversity (of species and ecosystems) is good because they are a valuable source of knowledge and resilience. And as a species we've done rather poorly in that regard, especially in the last century.