To suggest draining such a vital natural landscape and replacing its inhabitants with "friendly" animals ignores the intricate interdependencies that sustain these ecosystems. This not only threatens extinction of unique species but undermines the health of the entire region, affecting millions of people who rely on its ecosystem services. Demanding nature conform to a sanitized or human-safe version reflects a narrow, anthropocentric arrogance.
The wildness of the Everglades is part of its profound purpose and beauty. Any view that diminishes this is reductive, environmentally ignorant, and ethically troubling. Nature is not a backdrop to human desires but a living system demanding protection, understanding, and awe.
You're saying it as if you assume some external entity judging whether something exists for somebody or not.
As an atheist you would acknowledge that the entire concept of "existing for something/somebody" is entirely a construct of human mind, which human mentally applies to the observable universe around them. So for an atheistic human mind, everything exists for human, as there's nobody else to exist for.