Do we really have to get this started again ? The reason is quite simple - it is because the name you prefer it to be called is offensive to most people - including me.
This coin was given a name that they won't use. http://conecaonline.org/image/2000S25cMAsilverProofDieCrack.JPG
<<Wouldn't "Babies Runny Nose" be equally offensive? >> Yes, and you won't find that nickname being used on any major services slabs either. Also it is less offensive than other ways of expressing the appearance. A similar "offensive level" euphemisum for your coins would be "minuteman relieving himself" quarter.