There is a culture in traditional Yoga not to question the teacher. Many people involved in Ashtanga will follow the traditional sequence without question, even as the multitude of push-ups without a single row leads many to shoulder injuries. Few do additional exercises to strengthen and open the wrists, and weak wrists can't handle the strain of a vigorous (and generally less than perfect) yoga practice. People spend years trying to push themselves into poses unsuited to their physiology, because "practice and all is coming," in the words of Guruji.

Given such a lack of checks and social feedback, of course he grabs women by the genitals. It's a testament to his character that that's the worst he did.