Is Joran Van Der Sloot is an argument against legalized prostitution?

Many countries in Europe now have legalized prostitution because it is a "victimless" activity. I lived in one of the countries in the Europe that has actively attempted to keep prostitution illicit, which has been roundly criticized. When you see character like Joran Van Der Sloot (killed Natalee Holloway in Aruba) and his activities in white slavery, does it really seem like a victimless activity?