December 24, 2001 -- JOHN Walker Lindh's case may seem eccentric and unique. How many 20-year-olds from Marin County, Calif., especially ones named after a Beatle and children of a convert to Buddhism, end up in a dank cellar in Afghanistan fighting with the most fanatical of al Qaeda terrorists? Obviously, not many. But Walker illustrates three important and troublesome trends. * One concerns the powerful lure of militant Islam for alienated Westerners. What Walker, also known as Abdul Hamid, told his Islamic teacher in Pakistan - "In the U.S. I feel alone. Here I feel comfortable and at home" ...