"Filipino women do not hang out in Olangapo bars with sailors and marines unless they are either prostitutes or they have some other more nefarious agenda."
It's just a bad situation. It is possible to rape a prostitute. Most women in Olangapo bars are prostitutes, but not ALL of them. Unless you count those trying to find a husband and a way to America prostitutes, then you really get into that grey area.
I'm guessing it's just bad judgement, in a bad situation, and it's going to have a bad result. I don't think it's a conspiricy.
The common story among Sailors who married Philipino hooks was "She was from the province".