Dan Rather is a free man. After an appropriately acrimonious final round of legal wrangling, his 44 years with CBS News came to an end yesterday -- or will come to an end today. Or will end Friday. There's a bit of confusion on that point. Those who have followed the awkward exit of Rather from his position first as anchor of the "CBS Evening News" last year, then as a CBS News employee this year, often ask a simple question: How could a network for which Rather has done so much and served so loyally treat him so shabbily...