They are not "resignations;" they are 'resignations under pressure.'
...the pope accepted the resignation of Bishop Walter Mixa of Augsburg, the first bishop to quit in the pontiff's native Germany over the scandal that has rocked the Church in several European countries and the United States.
Mixa had admitted to hitting pupils and is now under investigation over accusations of sexual abuse, German prosecutors and church officials said.
In recent weeks, a Belgian bishop resigned after admitting he had sexually abused a boy, and three Irish bishops quit over their handling of sexual abuse cases.
B-16 is the New Broom, and his understanding of the abuse problem is VERY clear-eyed. The term "resignation" is diplomatic.
There will be more. Read the rest of the linked story for a hint.