Nature has rules, boundaries, and predetermined roles.

But that's just not true. There's no such thing as a predetermined role. That's the whole process of evolution. Nothing is predetermined. Things move and change, often in ways that seem nonsensical at first. For example, many species have switched back and forth between carnivory and herbivory throughout their ancient history. And even today many animals which we call herbivores will take advantage of a quick snack of meat. Both deer and horses have been observed doing this.

If you start with a false statement, of course you'll get a wacky conclusion.