[colordrops]

"Nature" is arbitrarly defined. There is nothing intrinsically wrong with anything. "Wrong" is a human definition. "Nature" is perfectly fine with wood and plastic piling up for eternity without decomposition if no organism happens to evolve to do so. "Nature" is fine with human genocide. "Nature" is fine with a nearby supernova or asteroid destroying all life on earth.

The point is that from a human perspective, and from the perspective of most multicellular organisms, plastics discarded into the environment are a really bad thing for our health.