You're aware that the prison scene depicts three men trapped in a cell as the city burns, frantically trying to lure the dog close so they can get the keys and escape, right? Not long after your boat sails past those three men are roasted alive and die hard. But hey, let's take the redhead scene out because that's something too terrible to handle. The point is, if you want to think too far into one thing, and completely ignore another, you're doing it wrong.
On that same subject, my wife--an actual redheaded human woman--laughed out loud when I told her they were replacing that scene and why. So I'm inclined to disagree with the "half the population" argument. Some people are able to enjoy an entire attraction for what it is, not just certain parts.