Regarding the article "Japan Ponders Securities Watchdog," Aug. 30: Is there a moral difference between compensating wealthy Japanese for losses in the Japanese securities market and granting preferential treatment to American banks "too big to fail"?Did not the FDIC permit small banks and their depositors to go under while paying full compensation to wealthy depositors in large banks? Why is this permitted in the US amid objections to the Japanese practice? Edwin Kessler, Purcell, Okla. 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.