Poor Judge Clarence Thomas! Just because he defied a stereotype and had the courage to pursue a pathway of hard work, courage, self-reliance, and assertive success, he is blamed for threatening the liberal claim to know what is best for minorities in this country and accused of "acting like a white."Why shouldn't blacks expand their options and have successful role models in people like Gen. Colin Powell and Judge Thomas rather than perpetrating a single paradigm endorsed by self-serving minority-rights groups? Olgard Dabbert, San Diego Letters are welcome. Only a selection can be published, subject to condensation, and none acknowledged. Please address them to "Readers Write," One Norway St., Boston, MA 02115.