Well one response could be that people develop a habit of using the bathroom or shower in the dark or near-dark whenever they're not entirely sure of the motive

Well one response could be that people develop a habit of using the bathroom or shower in the dark or near-dark whenever they're not entirely sure of the motives of whomever might maintain that bathroom. And a market for stupendously overpowered porrable infrared strobe lights that clip onto the back of your phone case will form alongside it. Whatever does develop as a response, one thing is certain:the victims bear the cost for defending themselves once again. thanks to an often overweening, at best misguided, and to be blunt, possibly self-interested motivation to protect the special interests of aggressors, predators and assholes at the victim's expense. See also: people whose response to someone pointing out that many aftermarket ( and increasingly, factory stock) headlamps are becoming bright enough to blind other drivers is to tell them, with a straight face, to wear sunglasses or get their windows tinted, or look away. At night. While driving.