I'm sure you must have a couple examples of their 'overt authoritarianism' - could you share more details?
Here are a few:
President Toda taught in his Lecture on the Sutra:
“With this silent prayer, we express our sincere thanks to the Second High Priest Nikko Shonin, the founder of Head temple Taisekiji. Hossui-shabyo: Hossui is the Law or Buddhism metaphorically compared to clean water. Shabyo means “transfer. Now suppose here are two glasses, one of which is filled with water. The water is transferred from one glass into the other. The quality of the water remains unchanged through this transfer even though the shapes of the glasses may differ. Simililarly, the Hossui of Nichiren Daishonin was handed down from Nikko Shonin to Third High Priest Nichimoku Shonin. However, its geneuine purity was not changed in the least. This solemn tradition has been strictly maintained by the successive high priests of Nichiren Shoshu.
YUIGA YOGA: This means that the life of Nikko Shonin equals that of Nichiren Daishonin. A Gohonzon called the “Tobi” (Flying) Mandala” is enshrined at Butsugenji Temple in Sendai City in Northeast Japan. It was inscribed co-operatively by the Daishonin and His immediate successor Nikko Shonin. This fact evidences what yuiga yoga signifies.” –Josei Toda as quoted in: From “Lectures on the Sutra” Third Edition, 1968 Seikyo Press.
"We, ourselves, cannot produce the Gohonzon. Since it's the
enlightened entity of Nichiren Daishonin, no one has the authority
other than the successive high priests who have been the sole heirs
to the heritage of the True Law.
We take no part in this. Therefore,
the objects of worship inscribed by those in the Butsuryu and Minobu
factions [of the Nichiren sect] are absolutely powerless. They are
worthless because they are fake. In fact, they contain the power of
evil spirits. That is why they are dangerous." Former SGI president,
Josei Toda, Daibyaku Renge, 98, p. 98.
"'Sacrifice your own skin to slash the opponent's flesh. Surrender your
own flesh to saw off the opponent's bone.' With their faithful
implementation of this well-known Japanese fencing (kendo) strategy
into actual practice during the war, the Japanese military is able to
achieve her glorious, ever-victorious invincibility in the Sino-Japan
conflict and in the Pacific war, and thus, easing the minds of the Japa-
nese people. This [strategy of sacrifice] should be held as an ideal
lifestyle for those remaining on the home front and should be applied
in every aspect of our daily life." --Tsunesaburo makiguchi
From:"The Instruction Manual Summarizing the Experiments and Testimonials of
Life based on the Philosophy of Value of the Supreme Goodness."