If I had to guess (and it appears that I am), I'd guess it has to do with our american way of overpackaging just about everything. Damn near anything you buy in the stores now has 2 or 3 layers of packaging on it. Is it really any wonder that some of those pieces of plastic blow away or slip out of a pocket or whatever? It's not an excuse for the litterers, just sayin'…

I couldn't imagine what a person would think excuses them to leave a dirty diaper. I wouldn't pack that out, but I would be tempted to burn it in the campfire (albeit while I'm at a safe distance from that level of stink).