I read the opinion-page column "Indians Bet on Gambling," Aug. 12, with interest. So far we have introduced the Indians to deadly diseases, guns, alcohol, environmental trashing, racial discrimination, and now gambling as an industry. This exploitation of white weakness may be the economic boom that Indians clearly need and deserve. But judging from the rise of problem gambling I am concerned that again we may have introduced Indians to a social problem of significant magnitude.What kind of people are we - the richest and in many ways the most advanced society in history - that contact with us can be so destructive? Victoria Punnett, Fort Myers, Fla. 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.