[Serious] Why defecation?

[John 6IX Breezy]

That's fine. But those three, contaminated ground and water, wasted resources, and contributions to global warming, are double-plus ungood.

Take contamination, for example. The word is species-dependent. Feces is contaminated from a human perspective because it has microorganisms which can cause disease in us. But those same microorganisms might not cause disease in another species. And more importantly microorganisms are themselves just using our fecal matter for their own survival. Feces is to them a buffet, not contaminated waste.

Put in other words, contamination often refers to the presence of bacteria. Which is an issue independent of the fecal matter itself.