Sorry Aries2756 but Raglayim L’davar does not mean that one most know for sure rather the closest translation that could be applied is probable suspicion and even that is not wholly accurate as many other things factor in.
And yes of course someone who was actually molested knows for sure however it is the Beis Din that is Matir him to be Moiser that must be convinced there is raglayim ludvur as in their eyes both the accused and accuser are “reshaim”.