On the question of how to know who the predators are: I cast my mind back to my undergraduate philosophy department. I was taught there by seven philosophy professors, three of them men. (It is a women’s college.)
One of those men subjected me to unwanted advances at the beginning of my graduate program, after describing to me just how important the politics and power gradients in the philosophy world were. Another was sleeping with (at least) one of my classmates in his senior seminar.
I have no positive reason to believe the third of those men engaged his students inappropriately. Yay?