I used to prosecute child abuse and child molestation cases. The notion that making skiers watch some one hour video is going to have any meaningful positive impact is ridiculous.
Now, on the other hand, education and training for children to understand what is and isn't appropriate and to know that they have many around who will support any report they make does help greatly. Most every school system in this country once had such programs. Well, until recently...now we have transvestite reading hour, the distribution of condoms to fifth graders and the general sexualization of children in school.
Another thing that it helpful to children is to have parents who watch them like hawks and who, by their actions, let all know that should harm come to their child, all hell will break loose. That is not to say that those children are 100% safe from such conduct, but it sure betters the odds.