If I recall correctly, isn't it when one of our senses is lacking, the others make up for it by being stronger?
Perhaps their smell and feel of the poop still lingering is what keeps them going until the white flag is raised.
Speaking of people taking a dump, I keep getting PM's from zito begging me to let him take a dump on my chest. Don't know what that's all about fwiw, just thought it was kind of random. He keeps threatening to take everyone back to Scout if I don't allow it... not sure what I'm supposed to do in this instance.