The Hag is part of nature. She is part of the Dark Feywild. Yes, she is a predator, and predators seek prey, always. They seek the weakest in the specifies to prey on always, like all predators do. That prey just happens to be us so we label it evil.
Yet if you are strong, wise, and diplomatic you can coexist with the Hag just fine. The Gur do it because they pass around the wisdom of such things. The Gur are not evil.
The hag clearly isn't part of the nature, she is evil twisted creature, interfering in natural cycles. This kind of hag doesn't protect the forest, but only deform it to her perverted desires. Additionally when role playing a ranger it's clearly pointed out in the dialog option that she must die because of her unnatural and destructive actions
