PERPETUAL DIVERSITY: Their symbol is Pisa’s leaning tower; one of their slogans is ‘Save Europe’; their staff includes Mrs. Sharity Ross-Petit, a Black woman who leads their Motherland Project, an effort to reclaim the African heritage of her people and get compensation for those who were enslaved — and Bob Hoy, former newspaperman and Reagan appointee, now a top expert on Russia and a leader in bringing understanding between our two countries: They are the Center for Perpetual Diversity, and their goal is  to stop the cultural and genetic destruction of Europe which, they say, may reach the point of no return within ten years. Globalization and racial homogenization destroy diversity, so the Center is well-named.