Chimps don't fight with rocks and sticks. That is a fantastism. Apes pound and claw.
Humans are the only creatures who can accurately and quickly swing a stick or throw a rock.
All this said, I think we're mostly getting caught up in semantics a bit. I do take your point of course, yeah Rangers do use the tools of "civilization", but I don't think civilization has to be strictly antithetical to nature from the point of view of a Ranger, because humanity is nature still. Despite itself.
And I would also say that utilizing magic could be seen as using the rules o- uh, tools of nature. If my contention that there is magic in all nature is acceptable. Which it may not be for everyone! That's just something I personally like. Like I say I don't have it all puzzled together, but there's a nugget of something I enjoy there. That's an asset Rangers have, they have that instinct.