I don't know about being against the laws of nature but I do think doing such a thing requires thought and training. There was a guy named Timothy Treadwell who tried to live in the Alaskan wilderness alongside grizzly bears. Despite being completely uneducated in wildlife biology and taking incredibly unnecessary risks, he survived for several years before getting eaten. The bear (they think) did it was shot and killed. In the end, for all his effort, he only ended up getting himself, his girlfriend and one bear killed.
If someone realistically has the skills to get out in the field and study wildlife then go for it. Otherwise, there are way better ways to help wildlife than putting them and yourself in danger. Contribute to wildlife organizations, support legislation and politicians that are good for animals, and make solid conservation decisions.