I'm really surprised by the number of times I've seen the argument in this thread comparing a scene that depicts a sexual slave trade with scenes depicting theft and arson. These are extremely different scenes showing extremely different kinds of crime. One is a scene depicting the debasement of fellow human beings—who are shown literally tied up and crying, while pirates (and ride guests!) laugh at their despair—and the others are scenes depicting property crimes. Theft isn't good, sure, but on the scale of human evil it's nowhere close to human trafficking and rape. Losing money to theft or arson is not the same thing as losing freedom or sexual autonomy. There is no way for a "slippery slope" argument to apply in this case.
I've also never been in the position of having to explain this particular scene to a child, but I have had to explain rape jokes in other scenarios, and why other adults have laughed at them. In every case, it has made the kids feel terrible that 1) sometimes adults attack each other, 2) some adults think that those attacks are funny, and 3) even adults who don't think those attacks are funny themselves nevertheless condone other adults joking about it, because it is more important to them to protect joking adults than it is to protect the feelings of people who might be hurt. And I don't blame the kids for feeling bad, because it makes me sad that all of these things are true, too.
Every time that Disney updated POTC without altering that scene, they endorsed that scene—each time they said that other aspects of the ride needed to be changed but that scene did not, they said that scene was worth keeping. Which put Disney, as a company, in either group two (the adults who think sexual slavery is funny) or group three (the adults who don't think sexual slavery is funny but care more about protecting the people that do than the people who that scene might hurt). And, I have to say, I am more comfortable and happier going to a Disneyland that is run by people who no longer want to be in either one.