Would you prefer the "humans are basically good" narrative?
Do you honestly find that to be a better explanation of human history the past few thousand years than "humans are evil, and the cause of all nature's ills"?
Personally, I find the latter proves true to life. Better to accept it and deal with it, than to sweep it under the rug.
That's assuming that all the harm we do, we do it just to do harm. I think this assumption is false. Most of the harm we do is a side effect of things we're trying to achieve.
So, basically, we're just another (slightly smarter) animal.
It's not like, for example, invasive species introduced from another continent stopped for a second and thought: "hey! maybe we shouldn't breed too much and we shouldn't eat all the bees/birds/whatever!".
Life is like a gas, it expands to fill all the space given to it.
I don't think that's inherently bad. After all, life is the exception in the universe. And frankly, most of the universe is boring :)
Do you honestly find that to be a better explanation of human history the past few thousand years than "humans are evil, and the cause of all nature's ills"?
Personally, I find the latter proves true to life. Better to accept it and deal with it, than to sweep it under the rug.