The statement that Thomas "lacks the distinguishing passion for justice for American minorities that has characterized the career of Thurgood Marshall" is surely an assumption on the writer's part. Just because he has opposed programs, supported by Marshall and other liberals, that have kept blacks on welfare and in the ghetto does not mean he lacks a "passion for justice." It perhaps means just exactly the opposite!With reference to the comment regarding Thomas's "mid-class Yale" performance, how good was the collegiate performance of the present (and past) members of the court? William Roberts, Laguna Beach, Calif. 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.