You have to know about it to defend against it. Women aren’t the only people getting roofied, and date rape isn’t the only thing that people are being roofied for.
Also, saw more than a couple cases of this when I worked IT for some attorneys. Some of the demonstrations of that stuff... hooooo boy.
No argument about women getting “roofied” at bars, but if I recall from the details of this Cosby case, these women went to his apartment. They were looking for something. You don’t go into private with a married man and expect to come out unscathed.