well, acts of rape being taped and showed in school usualy would be there to show signs to look out for for girls and guys alike, like if it was a raping vidio tape being shown, it would say something like "dont go into dark, empty allies", and things like that, also another example of a rape vidio tape would be "look if your being followed"
that would be concidered sex education or self defence, if in a self defence class. or even in a psycolagy class.
the same would go for the beheading vidio tape, what would make them do such a thing, what to look for and like that