I have no way of knowing whether I've met a coprophiliac yet (and boy, am I glad...) but I have a suspicion that such a person would hold no self-delusions that what he does is somehow... not disgusting. They probably know it (and that is why they hide it) but can't hold their urges: they need it... but they try to remain self-respecting by keeping their shit private. Coprophiliacs are more worthy persons that fatsos.