Both SGI and the Five Senior Priests have destroyed the teachings and their members for the same reasons

They protect their members from persecution by altering and compromising the teachings. For example, SGI, interfaith compromises the teachings while, from a most superficial perspective, it "protects" the members from, for example, the Muslim governments of Malaysia and Indonesia and the Christian society of Italy. The Five Senior Priests called themselves Tientai priests to avoid persecution against Nichiren believers. Unfortunately, not only do they destroy the teachings but they destroy their members ability to develop the hearts of a lion through persecution.