Years later, Alpert/Ram Dass mused that one reason he had slipped up and allowed an undergraduate into the study was because he had found the undergraduate attractive. There is no suggestion that he acted on the attraction. He was simply looking back on his own motivations, reflecting on what might have led to his career-destroying move.
One of Ram Dass's qualities as a spiritual teacher/speaker/seeker has been an unusual openness about his personal experiences. He was talking about being gay, for example, long before that was socially acceptable. I think it is a positive thing that he has been so willing to share his own struggles and challenges. Maybe when some other guru character admits to an "attraction" years later, that would be a euphemism for "seduced" or "raped". But there is no reason or evidence to conclude that here. This was just Ram Dass sharing his experience with the same openness he always has.
Listening to some of Ram Dass's talks from the 70s, I've been struck by how far ahead of his time he was in facing up to the power dynamics between gurus and disciples, and especially the sexual power dynamics between them. His statements on this from over 40 years ago sound pretty contemporary today. That's unusual, given how different a time that was. So unless you guys have specific evidence that Alpert raped people, I can't help but think you're picking on the wrong figure.