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RMS has a chip on his shoulder from a time when somebody STOLE his Emacs code and built a better Emacs from it. Today, user's of XEmacs are essentially working off this other base. When RMS speaks, he usually tells of his sob story over this and how wrong it was that somebody took his code and modified it without his permission and distributed it.
Anyhow... I just wanted to add that so people have a better insight into RMS.