Perhaps that last paragraph stretches the boundary a bit in terms of forum rules, but I'm glad you said it,
@Smallest_Sparrow. I wholeheartedly, totally, and completely agree, especially with the last sentence.
But it's actually quite pertinent to the Camino, and not just a rant about our culture. One thing walking the Camino does is to remind us is that we are none of us in this life alone--we depend on community, and deeply affect one another with our thoughts, words, and deeds. Once people get that, a whole lot of thoughtlessness can drop away. Bit it's too bad the sharpie crowd are not sharp enough to 'get it'.
@Kanga came up with a great idea about how to practically deal with TP; in the same spirit, perhaps to give fellow peregrinos alcohol wipes would be a start at education? At the very least we can all do our part to help clean up some unsightly stuff, rather than only grumbling about it.