Why do people look at the toilet paper wen they wipe? Some of us just do I guess. For me it's just an odd fascination/curiousity. Now that I know about parasites and mucoid plaque its even more interesting. Yeah it's gross but also kind of cool. It's also probably satisfying to get a lot of junk out of you because you know it's not inside you destroying your body. If you prefer not to see then go ahead and flush it away. No harm done.