R. Emmett Tyrrell Pontiac Daily Leader WASHINGTON — Years ago, I had a great coach in high school who was given to Solomonic apothegms. One of his favorites was, "Forget your grandparents." By that, he meant forget the arguments that issued from your grandparents' grudges with other grandparents. The high school he coached at was highly diverse, sufficiently diverse to have frequent warfare among the differing ethnic groups. My coach, Tony Lawless, thought we should forget our ethnic or racial conflicts — simply forget them and move on. The high school that Mr. Lawless coached at and that I attended was a high-diversity high school. We had Italians, Irish, Polish, Latinos (though they were not called Latinos then, probably Mexicans or Puerto Ricans) and even a few Blacks. It was the early 1960s, and diversity was not a sacred, unassailable value. I remember one Saturday at a football game, the Italian students who were sitting together in the stands began chanting, "Benito, Benito, Benito Mussolini." They were not chanting it in a friendly way. I doubt they knew their fathers had fought Benito Mussolini 20 years before.