SGI criticizes Nichiren. Nichiren has this to say.

"Olivier Urbain shows that while Soka Gakkai (the "value society") may stem from the medieval principles of Nichiren Buddhism, under Ikeda's leadership it has taken these classic wisdoms and transformed them. Now essentially classless and secularised, as well as adaptable and sensitive to modern challenges like resource shortages and climate change, this, argues the author, is a pragmatic approach to peace which has proved both popular and eminently transportable." -- Forward to Daisaku Ikeda Peacebuilder

"Some people criticize me, saying, “Nichiren does not understand the capacities of the people of the time, but goes around preaching in a harsh manner—that is why he meets with difficulties.” Other people say, “The practices described in the ‘Encouraging Devotion’ chapter are for bodhisattvas who are far advanced in practice; [Nichiren ought to follow the practices of] the ‘Peaceful Practices’ chapter, yet he fails to do so.” Others say, “I, too, know the Lotus Sutra is supreme, but I say nothing about it.” Still others complain that I give all my attention to doctrinal teachings.

I am well aware of all these criticisms against me. But I recall the case of Pien Ho, who had his legs cut off at the knee, and of Kiyomaro (Pure Man), who was dubbed Kegaremaro (Filthy Man) and almost put to death. All the people of the time laughed at them with scorn, but unlike those two men, those who laughed left no good name behind them. And all the people who level unjust criticisms at me will meet with a similar fate." -- Nichiren