S. F. neighborhood once known as a haven for drifters is overrun by disenfranchised homeless youths SAN FRANCISCO -- From his second-floor apartment at the counterculture crossing of Haight and Ashbury streets, Arthur Evans watches a new generation of wayward youth invade his free-spirited neighborhood. The former flower child was among the legions of idealistic wanderers who migrated here during the Vietnam War to "tune in, turn on and drop out." But Evans, who has lived at the same address for 34 years, says he has never seen anything like this crowd, who use his flower bed as a bathroom...