Convergent evolution. As soon as you get animals you get resource competition, violence, and a food chain with a predator at the top. In more sophisticated species you also get dominance/submission hierarchies.

It's possible at some point a species might transcend that and become wholly benevolent. It's also possible that some species are cooperative colony organisms which somehow evolve intelligence, self-awareness, and technology.

But at a guess it's more likely that most species remain aggressive and competitive for a very long time, and they'll only ignore humans if we aren't complex enough to be a threat - now or in the future - and have nothing worth stealing or harvesting.

Best case: you save some marginal resources.

Worst case: that civilization “grows up” and develops the means to destroy you.