I think it is more than fair to portray the Pirates of the Caribbean ride as a fantasy experience to engage the audience with a somewhat period correct (and historical) context, whether this be costumes, ships, weapons etc.... If symbolism such as the 'Red head' scene are to be censored and interpreted as being provocative and emotively jarring given their subject matter, then this creates a myriad of problems for the many other attractions within the parks. It's ok to be offended at things that others are not, irrespective of your position on the opinion continuum.
A few have already mentioned it here, the fact that poor Carlos is being given a Pirates equivalent of 'Water Boarding' would be one, or the very fact that the Pirates themselves are burning down an entire village... lest we forget the rampant alcoholism?!? None of which have ever created anything other than fantastical diversion in any of my own children. IF anything, those kinds of scenes actually act as a stimulus for questions and present a fantastic (and organic) learning opportunity. Not all history is rosy, not all history is bad either. Having elements of a ride that can support both is going to be a successful proposition.
From my own perspective, I am not sure how changing this particular aspect of an emotionally charged and favored ride (by many given Walt's affiliation with it) is going to offset any element of offense or angst it presented to some customers. This thread and other like it should highlight that fact perfectly, it will create as many emotionally charged issues as it intends to solve / appease.