People, for a whole host of reasons, can be and very much are in different situations than you. Some have very little defense against such allegations, and so it should not be very difficult to understand that they could have their lives destroyed in an instant by false accusations.
For instance, if they engage in non-normalized sexual relations (for their area or country, obviously), be that interracial, same sex, BDSM, etc., particularly if they are not “out”. It’s very easy to go from “he tied me up and we had a great time”, to “that guy did me wrong somehow so now I’m going to press charges and claim he tied me up against my will and raped me”. If you don’t think this happens you’re living in a dream land.